{
    "cdp_num": null,
    "comment": "The antenna is 7.5 m above the\r\nground.\r\nIn addition and parallel a\r\nLEICA GR25 GNSS Receiver,\r\nFour Character ID WTZR,\r\nIGS Reference Frame Station, on\r\npillar 1202, Domes No. 14201M010,\r\nan ASHTECH Z-XII3T Metronome GPS\r\nReceiver, Four character ID WTZA,\r\non pillar 1204, Domes No. 14201M013,\r\na JPS LEGACY GPS+GLONASS Receiver,\r\nFour character ID WT21, on\r\npillar 21, DOMES No. 14201M021\r\nand a SEPT POLARX2 GPS Receiver,\r\nFour character ID WTZS, DOMES No.\r\n14201M015 are observing.\r\nPrior we observed here in the\r\nGeodetical Observatory Wettzell\r\nwith a TI-4100, a MiniMac 2816 AT,\r\na Rogue SNR-800, our # 1200, Four\r\nCharacter ID WETT, Domes No.\r\n14201M009, a 3SNAV R101 GPS+GLONASS,\r\nFour character ID WTZG on pillar\r\n1203, Domes No. 14201M012, a\r\nTRIMBLE 4000SSI, Four character\r\nID WTZT, on pillar 1201, Domes No.\r\n14201M011 a JPS LEGACY GPS+GLONASS\r\nReceiver, Four charcter ID WTZJ, on\r\npillar 1203, DOMES No. 14201M012\r\na TPS NETG3 GPS+GLONASS Receiver,\r\nFour character ID WTZL, on\r\npillar 1206, DOMES No. 14201M022.\r\nFurther informations and effective date\r\nsee sections 5 and 7.",
    "conditions": [],
    "country": "Germany",
    "country_code_ISO": "DEU",
    "date_from": "1998-10-18 00:00:00",
    "date_to": null,
    "description": "STEEL REFERENCE SURVEY MARKER 1205",
    "geological": {
        "bedrock": {
            "condition": "WEATHERED",
            "type": null
        },
        "characteristic": "BEDROCK",
        "distance_to_fault": null,
        "fault_zone": "NO",
        "fracture_spacing": "51-200"
    },
    "iers_domes": "14201M014",
    "instrument_collocation": [
        {
            "comment": "",
            "date_from": "1977-01-01 00:00:00",
            "date_to": "1991-12-31 00:00:00",
            "status": "PERMANENT",
            "type": "SLR 7834"
        },
        {
            "comment": "",
            "date_from": "1983-01-01 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "VLBI 7224"
        },
        {
            "comment": "",
            "date_from": "1984-01-01 00:00:00",
            "date_to": "1997-12-31 00:00:00",
            "status": "MOBILE",
            "type": "SLR MTLRS 1"
        },
        {
            "comment": "",
            "date_from": "1984-01-01 00:00:00",
            "date_to": "1993-12-31 00:00:00",
            "status": "PERMANENT",
            "type": "TRANSIT NNSS-DMA DOPPLER"
        },
        {
            "comment": "CIGNET GPS Station",
            "date_from": "1987-11-12 00:00:00",
            "date_to": "1989-07-27 00:00:00",
            "status": "PERMANENT",
            "type": "TI-4100 GPS"
        },
        {
            "comment": "",
            "date_from": "1988-01-01 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "SLR WLRS 8834"
        },
        {
            "comment": "",
            "date_from": "1989-01-01 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "SUPER CONDUCTING GRAVIMETER"
        },
        {
            "comment": "CIGNET GPS Station",
            "date_from": "1989-05-23 00:00:00",
            "date_to": "1991-07-23 00:00:00",
            "status": "PERMANENT",
            "type": "MINIMAC 2816 AT GPS"
        },
        {
            "comment": "",
            "date_from": "1991-01-01 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "VERY BROAD BAND SEISMOGRAPH"
        },
        {
            "comment": "",
            "date_from": "1991-01-01 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "LLR WLRS"
        },
        {
            "comment": "CIGNET \/ CORE \/ IGS Station",
            "date_from": "1991-07-23 00:00:00",
            "date_to": "1997-02-02 00:00:00",
            "status": "PERMANENT",
            "type": "ROGUE SNR-800 GPS WETT # 1200"
        },
        {
            "comment": "",
            "date_from": "1994-01-01 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "PRARE"
        },
        {
            "comment": "IGS Referece Frame Station",
            "date_from": "1995-02-09 00:00:00",
            "date_to": "1999-06-17 00:00:00",
            "status": "PERMANENT",
            "type": "ROGUE SNR-8000 GPS WTZR # 1202"
        },
        {
            "comment": "TIGO Transportable Integrated\r\nGeodetc Observatory",
            "date_from": "1997-01-01 00:00:00",
            "date_to": "2001-12-01 00:00:00",
            "status": "MOBILE",
            "type": "TIGO VLBI"
        },
        {
            "comment": "TIGO Transportable Integrated\r\nGeodetic Observatory",
            "date_from": "1997-01-01 00:00:00",
            "date_to": "2001-12-01 00:00:00",
            "status": "MOBILE",
            "type": "TIGO SLR"
        },
        {
            "comment": "",
            "date_from": "1997-02-06 00:00:00",
            "date_to": "2005-05-17 00:00:00",
            "status": "PERMANENT",
            "type": "TRIMBLE 4000SSI WTZT # 1201"
        },
        {
            "comment": "",
            "date_from": "1997-11-25 00:00:00",
            "date_to": "2001-11-08 00:00:00",
            "status": "PERMANENT",
            "type": "ASHTECH Z-XII3 GPS WTZA # 1204"
        },
        {
            "comment": "",
            "date_from": "1998-10-14 00:00:00",
            "date_to": "1999-09-04 00:00:00",
            "status": "PERMANENT",
            "type": "3SNAV R101 OLD GPS+GLONASS WTZG # 1203"
        },
        {
            "comment": "IGS Reference Frame Station",
            "date_from": "1999-06-17 00:00:00",
            "date_to": "2005-05-04 00:00:00",
            "status": "PERMANENT",
            "type": "AOA SNR-8000 ACT GPS WTZR # 1202"
        },
        {
            "comment": "",
            "date_from": "2001-07-03 00:00:00",
            "date_to": "2010-10-27 00:00:00",
            "status": "PERMANENT",
            "type": "JPS LEGACY GPS+GLONASS WTZJ # 1203"
        },
        {
            "comment": "",
            "date_from": "2001-09-01 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "RINGLASER GYROSCOPE"
        },
        {
            "comment": "",
            "date_from": "2001-11-08 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "ASHTECH Z-XII3T GPS WTZA # 1204"
        },
        {
            "comment": "",
            "date_from": "2003-10-14 00:00:00",
            "date_to": "2009-05-12 00:00:00",
            "status": "PERMANENT",
            "type": "ASHTECH Z-XII3 GPS WT21 #21"
        },
        {
            "comment": "",
            "date_from": "2004-03-23 00:00:00",
            "date_to": "2007-12-06 00:00:00",
            "status": "PERMANENT",
            "type": "LEICA GRX1200PRO GPS WTZL # 1206"
        },
        {
            "comment": "IGS Reference Frame Station",
            "date_from": "2005-05-04 00:00:00",
            "date_to": "2007-05-29 00:00:00",
            "status": "PERMANENT",
            "type": "TPS E_GGD GPS+GLONASS WTZR # 1202"
        },
        {
            "comment": "",
            "date_from": "2005-07-27 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "SEPT POLARX2 GPS WTZS"
        },
        {
            "comment": "IGS Reference Frame Station",
            "date_from": "2007-05-29 00:00:00",
            "date_to": "2008-01-25 00:00:00",
            "status": "PERMANENT",
            "type": "TPS NETG3 GPS+GLONASS WTZR # 1202"
        },
        {
            "comment": "",
            "date_from": "2007-12-06 00:00:00",
            "date_to": "2008-03-04 00:00:00",
            "status": "PERMANENT",
            "type": "LEICA GRX1200GGPRO GPS+GLONASS WTZL # 1206"
        },
        {
            "comment": "IGS Reference Frame Station",
            "date_from": "2008-01-25 00:00:00",
            "date_to": "2011-04-14 00:00:00",
            "status": "PERMANENT",
            "type": "LEICA GRX1200GGPRO GPS+GLONASS WTZR # 1202"
        },
        {
            "comment": "",
            "date_from": "2008-03-04 00:00:00",
            "date_to": "2008-09-18 00:00:00",
            "status": "PERMANENT",
            "type": "TPS NETG3 GPS+GLONASS WTZL # 1206"
        },
        {
            "comment": "",
            "date_from": "2009-05-12 00:00:00",
            "date_to": "2009-05-25 00:00:00",
            "status": "PERMANENT",
            "type": "JPS LEGACY GPS+GLONASS WT21 #21"
        },
        {
            "comment": "",
            "date_from": "2009-05-25 00:00:00",
            "date_to": "2010-10-27 00:00:00",
            "status": "PERMANENT",
            "type": "TPS NETG3 GPS+GLONASS WT21 #21"
        },
        {
            "comment": "",
            "date_from": "2010-10-27 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "JPS LEGACY GPS+GLONASS WT21 #21"
        },
        {
            "comment": "IGS Reference Frame Station",
            "date_from": "2011-04-14 00:00:00",
            "date_to": "2014-02-13 00:00:00",
            "status": "PERMANENT",
            "type": "LEICA GRX1200+GNSS WTZR # 1202"
        },
        {
            "comment": "IGS Reference Frame Station",
            "date_from": "2014-02-13 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "LEICA GR25 WTZR # 1202"
        }
    ],
    "local_ties": [
        {
            "accuracy": 1,
            "comment": null,
            "cpd_num": "7224",
            "date_at": "1995-02-13 15:00:00",
            "dx": -0.9817,
            "dy": -0.2944,
            "dz": 1.0882,
            "iers_domes": "14201M009",
            "name": "1200  ROGUE SNR-800 = WETT",
            "survey_method": "TRIANGULATION",
            "usage": "GPS"
        },
        {
            "accuracy": 1.3,
            "comment": null,
            "cpd_num": "8834",
            "date_at": "2004-10-01 10:00:00",
            "dx": -39.674,
            "dy": -117.7099,
            "dz": 60.4149,
            "iers_domes": "14201S004",
            "name": "VLBI Ref Point",
            "survey_method": "TRIANGULATION",
            "usage": "VLBI"
        },
        {
            "accuracy": 0.6,
            "comment": null,
            "cpd_num": "7593",
            "date_at": "2004-10-01 10:00:00",
            "dx": -2.7005,
            "dy": -67.5152,
            "dz": 14.6118,
            "iers_domes": "14201S018",
            "name": "SLR WLRS",
            "survey_method": "TRIANGULATION",
            "usage": "SLR"
        },
        {
            "accuracy": 0.9,
            "comment": null,
            "cpd_num": "7594",
            "date_at": "2004-10-01 10:00:00",
            "dx": -7.774,
            "dy": -98.0558,
            "dz": 14.3448,
            "iers_domes": "14201S100",
            "name": "TIGO WTZL VLBI",
            "survey_method": "TRIANGULATION",
            "usage": "VLBI"
        },
        {
            "accuracy": 1.5,
            "comment": null,
            "cpd_num": null,
            "date_at": "2004-10-01 10:00:00",
            "dx": 15.4802,
            "dy": -120.0218,
            "dz": -1.3882,
            "iers_domes": "14201M200",
            "name": "TIGO WTZL SLR",
            "survey_method": "TRIANGULATION",
            "usage": "SLR"
        },
        {
            "accuracy": 0.4,
            "comment": "IGS Reference Frame Station",
            "cpd_num": null,
            "date_at": "2004-10-01 10:00:00",
            "dx": 1.1233,
            "dy": 0.6866,
            "dz": -0.9058,
            "iers_domes": "14201M010",
            "name": "1202  LEICA GR25 = WTZR",
            "survey_method": "TRIANGULATION",
            "usage": "GPS+GLO+GAL+SBAS"
        },
        {
            "accuracy": 0.4,
            "comment": null,
            "cpd_num": null,
            "date_at": "2004-10-01 10:00:00",
            "dx": -1.9479,
            "dy": 2.3083,
            "dz": 1.2515,
            "iers_domes": "14201M011",
            "name": "1201  TRIMBLE 4000SSI = WTZT",
            "survey_method": "TRIANGULATION",
            "usage": "GPS"
        },
        {
            "accuracy": 0.4,
            "comment": null,
            "cpd_num": null,
            "date_at": "2004-10-01 10:00:00",
            "dx": 0.4575,
            "dy": 2.2556,
            "dz": -0.7776,
            "iers_domes": "14201M012",
            "name": "1203 JPS LEGACY = WTZJ",
            "survey_method": "TRIANGULATION",
            "usage": "GPS+GLONASS"
        },
        {
            "accuracy": 0.4,
            "comment": null,
            "cpd_num": null,
            "date_at": "2004-10-01 10:00:00",
            "dx": -1.0676,
            "dy": -0.315,
            "dz": 0.9858,
            "iers_domes": "14201M013",
            "name": "1204 ASHTECH Z-XII3T = WTZA",
            "survey_method": "TRIANGULATION",
            "usage": "GPS"
        },
        {
            "accuracy": 0.4,
            "comment": null,
            "cpd_num": null,
            "date_at": "2004-10-01 10:00:00",
            "dx": -1.5194,
            "dy": 0.9934,
            "dz": 1.1198,
            "iers_domes": "14201M022",
            "name": "1206 TPS NETG3 = WTZL",
            "survey_method": "TRIANGULATION",
            "usage": "GPS"
        }
    ],
    "location": {
        "city": "Bad Koetzting",
        "coordinates": {
            "X": 4075579.1,
            "Y": 931853.4,
            "Z": 4801569.2,
            "altitude": 665.8,
            "lat": 49.14421495353393,
            "lon": 12.878908892613214
        },
        "country": "Germany",
        "country_iso_code": "DEU",
        "description": "",
        "state": "Bavaria",
        "tectonic": {
            "plate_name": "EURASIAN"
        }
    },
    "logs": {
        "contact": "GOW Operator (gnss_wtz@bkg.bund.de)",
        "date": "2026-03-10 00:00:00",
        "log_type": "UPDATE",
        "modified": "UNAVAILABLE",
        "previous": "UNAVAILABLE",
        "title": "WTZZ00DEU.xml"
    },
    "marker": "WTZZ",
    "monument": {
        "description": "STEEL PLATE ON CONCRETE SURVEY TOWER",
        "foundation": "SCREW ANCHORED TO CONCRETE SURVEY TOWER",
        "foundation_depth": null,
        "height": 0.8,
        "monument_inscription": "Pillar 1205"
    },
    "monument_num": 0,
    "name": "Wettzell \/ Germany",
    "receiver_num": 0,
    "station_contacts": [
        {
            "contact": {
                "agency": {
                    "abbreviation": "BKG",
                    "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                    "infos": "",
                    "name": "Bundesamt fuer Kartographie und Geodaesie",
                    "www": ""
                },
                "comment": "",
                "email": "gnss_wtz@bkg.bund.de",
                "name": "GOW Operator",
                "phone": "+49 9941 6030",
                "role": "site_owner",
                "title": ""
            }
        },
        {
            "contact": {
                "agency": {
                    "abbreviation": "BKG",
                    "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                    "infos": "",
                    "name": "Bundesamt fuer Kartographie und Geodaesie",
                    "www": ""
                },
                "comment": "",
                "email": "gnss_wtz@bkg.bund.de",
                "name": "GOW Operator",
                "phone": "+49 9941 6030",
                "role": "metadata_custodian",
                "title": ""
            }
        }
    ],
    "station_items": [
        {
            "item": {
                "comment": "ASHTECH has not assigned\r\na serial number for this\r\nreceiver.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1999-02-01 12:00:00",
                "date_to": "1999-08-17 10:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "1999-02-01 12:00:00",
                        "date_to": "1999-08-17 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "ASHTECH Z18"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1999-02-01 12:00:00",
                        "date_to": "1999-08-17 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "ZX1999909119"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "1999-02-01 12:00:00",
                        "date_to": "1999-08-17 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "1999-02-01 12:00:00",
                        "date_to": "1999-08-17 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "V5100"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "1999-02-01 12:00:00",
                        "date_to": "1999-08-17 10:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "1999-02-01 12:00:00",
                        "date_to": "1999-08-17 10:00:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "ASHTECH has not assigned\r\na serial number for this\r\nreceiver.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1999-08-17 10:00:00",
                "date_to": "2001-05-15 12:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "1999-08-17 10:00:00",
                        "date_to": "2001-05-15 12:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "ASHTECH Z18"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1999-08-17 10:00:00",
                        "date_to": "2001-05-15 12:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "ZX1999909119"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "1999-08-17 10:00:00",
                        "date_to": "2001-05-15 12:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "1999-08-17 10:00:00",
                        "date_to": "2001-05-15 12:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "V6400"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "1999-08-17 10:00:00",
                        "date_to": "2001-05-15 12:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "1999-08-17 10:00:00",
                        "date_to": "2001-05-15 12:00:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "ASTECH has not assigned\r\na serial number for this\r\nreceiver.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2001-05-15 12:00:00",
                "date_to": "2001-11-19 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2001-05-15 12:00:00",
                        "date_to": "2001-11-19 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "ASHTECH Z18"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2001-05-15 12:00:00",
                        "date_to": "2001-11-19 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "ZX1999909119"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2001-05-15 12:00:00",
                        "date_to": "2001-11-19 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2001-05-15 12:00:00",
                        "date_to": "2001-11-19 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "0065"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2001-05-15 12:00:00",
                        "date_to": "2001-11-19 00:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2001-05-15 12:00:00",
                        "date_to": "2001-11-19 00:00:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "ASHTECH Z18 on loan from\r\nppmgmbh Precise Management\r\nGmbH and the Magellan GPS\r\nCorp. United Kingdom during\r\nthe repair of our own\r\nASHTECH Z18.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2001-11-27 16:00:00",
                "date_to": "2002-01-14 07:30:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2001-11-27 16:00:00",
                        "date_to": "2002-01-14 07:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "ASHTECH Z18"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2001-11-27 16:00:00",
                        "date_to": "2002-01-14 07:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "ZX00109"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2001-11-27 16:00:00",
                        "date_to": "2002-01-14 07:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2001-11-27 16:00:00",
                        "date_to": "2002-01-14 07:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "0065"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2001-11-27 16:00:00",
                        "date_to": "2002-01-14 07:30:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2001-11-27 16:00:00",
                        "date_to": "2002-01-14 07:30:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "P\/N 800306 R3",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2002-01-14 07:30:00",
                "date_to": "2003-06-10 11:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2002-01-14 07:30:00",
                        "date_to": "2003-06-10 11:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "ASHTECH Z18"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2002-01-14 07:30:00",
                        "date_to": "2003-06-10 11:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "ZX00111"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2002-01-14 07:30:00",
                        "date_to": "2003-06-10 11:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2002-01-14 07:30:00",
                        "date_to": "2003-06-10 11:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "0065"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2002-01-14 07:30:00",
                        "date_to": "2003-06-10 11:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2002-01-14 07:30:00",
                        "date_to": "2003-06-10 11:00:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Additional Number\r\n235-0281 on the type level.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2003-06-10 11:00:00",
                "date_to": "2003-10-17 08:30:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2003-06-10 11:00:00",
                        "date_to": "2003-10-17 08:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JPS LEGACY"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2003-06-10 11:00:00",
                        "date_to": "2003-10-17 08:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "AGL2LHV3MXO"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2003-06-10 11:00:00",
                        "date_to": "2003-10-17 08:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2003-06-10 11:00:00",
                        "date_to": "2003-10-17 08:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "2.2 Jun,13,2002 p3"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2003-06-10 11:00:00",
                        "date_to": "2003-10-17 08:30:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2003-06-10 11:00:00",
                        "date_to": "2003-10-17 08:30:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "\/par\/lock\/notvis switched\r\nto \"on\".\r\nAdditional Number\r\n235-0281 on the type level.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2003-10-17 08:30:00",
                "date_to": "2003-11-06 06:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2003-10-17 08:30:00",
                        "date_to": "2003-11-06 06:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JPS LEGACY"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2003-10-17 08:30:00",
                        "date_to": "2003-11-06 06:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "AGL2LHV3MXO"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2003-10-17 08:30:00",
                        "date_to": "2003-11-06 06:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2003-10-17 08:30:00",
                        "date_to": "2003-11-06 06:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "2.3p2"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2003-10-17 08:30:00",
                        "date_to": "2003-11-06 06:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2003-10-17 08:30:00",
                        "date_to": "2003-11-06 06:00:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "No actual change in\r\nequipment took place,\r\nonly download software.\r\n\/par\/lock\/notvis switched\r\nto \"on\".\r\nAnd Serial Number corrected\r\nto AGL2LHV3XMO.\r\nAdditional Number\r\n235-0281 on the type level.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2003-11-06 06:00:00",
                "date_to": "2005-05-04 10:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2003-11-06 06:00:00",
                        "date_to": "2005-05-04 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JPS E_GGD"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2003-11-06 06:00:00",
                        "date_to": "2005-05-04 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "AGL2LHV3XMO"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2003-11-06 06:00:00",
                        "date_to": "2005-05-04 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2003-11-06 06:00:00",
                        "date_to": "2005-05-04 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "2.3 Aug,01,2003 p2"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2003-11-06 06:00:00",
                        "date_to": "2005-05-04 10:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2003-11-06 06:00:00",
                        "date_to": "2005-05-04 10:00:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "No actual change in\r\nequipment took place,\r\nonly download software.\r\n\/par\/lock\/notvis switched\r\nto \"on\".\r\nAdditional Number\r\n235-0281 on the type level.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2005-05-04 10:00:00",
                "date_to": "2005-11-30 13:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2005-05-04 10:00:00",
                        "date_to": "2005-11-30 13:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "TPS E_GGD"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2005-05-04 10:00:00",
                        "date_to": "2005-11-30 13:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "AGL2LHV3XMO"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2005-05-04 10:00:00",
                        "date_to": "2005-11-30 13:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2005-05-04 10:00:00",
                        "date_to": "2005-11-30 13:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "2.3 Aug,01,2003 p2"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2005-05-04 10:00:00",
                        "date_to": "2005-11-30 13:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2005-05-04 10:00:00",
                        "date_to": "2005-11-30 13:00:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "\/par\/lock\/notvis switched\r\nto \"on\".\r\nAdditional Number\r\n235-0281 on the type level.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2005-11-30 13:00:00",
                "date_to": "2007-05-23 09:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2005-11-30 13:00:00",
                        "date_to": "2007-05-23 09:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "TPS E_GGD"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2005-11-30 13:00:00",
                        "date_to": "2007-05-23 09:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "AGL2LHV3XMO"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2005-11-30 13:00:00",
                        "date_to": "2007-05-23 09:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2005-11-30 13:00:00",
                        "date_to": "2007-05-23 09:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "2.5 Jun,22,2005 p1"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2005-11-30 13:00:00",
                        "date_to": "2007-05-23 09:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2005-11-30 13:00:00",
                        "date_to": "2007-05-23 09:59:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "\/par\/lock\/notvis switched\r\nto \"on\".\r\nAdditional Number\r\n235-0281 on the type level.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2007-05-23 10:00:00",
                "date_to": "2007-06-28 09:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2007-05-23 10:00:00",
                        "date_to": "2007-06-28 09:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "TPS E_GGD"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2007-05-23 10:00:00",
                        "date_to": "2007-06-28 09:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "AGL2LHV3XMO"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2007-05-23 10:00:00",
                        "date_to": "2007-06-28 09:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2007-05-23 10:00:00",
                        "date_to": "2007-06-28 09:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "2.6.0 Apr,18,2007"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2007-05-23 10:00:00",
                        "date_to": "2007-06-28 09:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2007-05-23 10:00:00",
                        "date_to": "2007-06-28 09:59:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "\/par\/lock\/notvis switched\r\nto \"on\".\r\nAdditional Number\r\nLGGD SN 0244 on the type level.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2007-06-28 10:00:00",
                "date_to": "2008-01-14 13:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2007-06-28 10:00:00",
                        "date_to": "2008-01-14 13:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "TPS E_GGD"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2007-06-28 10:00:00",
                        "date_to": "2008-01-14 13:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "AFY49G7RSHS"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2007-06-28 10:00:00",
                        "date_to": "2008-01-14 13:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2007-06-28 10:00:00",
                        "date_to": "2008-01-14 13:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "2.6.0 Apr,18,2007"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2007-06-28 10:00:00",
                        "date_to": "2008-01-14 13:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2007-06-28 10:00:00",
                        "date_to": "2008-01-14 13:59:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "\/par\/lock\/notvis switched\r\nto \"on\".\r\nAdditional Number\r\nLGGD SN 0244 on the type level.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2008-01-14 14:00:00",
                "date_to": "2008-07-08 12:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2008-01-14 14:00:00",
                        "date_to": "2008-07-08 12:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "TPS E_GGD"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2008-01-14 14:00:00",
                        "date_to": "2008-07-08 12:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "AFY49G7RSHS"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2008-01-14 14:00:00",
                        "date_to": "2008-07-08 12:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2008-01-14 14:00:00",
                        "date_to": "2008-07-08 12:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "2.6.1 Jan,10,2008"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2008-01-14 14:00:00",
                        "date_to": "2008-07-08 12:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2008-01-14 14:00:00",
                        "date_to": "2008-07-08 12:00:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "\/par\/lock\/notvis switched\r\nto \"on\".\r\nAdditional Number\r\nLGGD SN 0244 on the type level.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2008-07-08 15:00:00",
                "date_to": "2010-03-26 09:14:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2008-07-08 15:00:00",
                        "date_to": "2010-03-26 09:14:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "TPS E_GGD"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2008-07-08 15:00:00",
                        "date_to": "2010-03-26 09:14:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "AFY49G7RSHS"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2008-07-08 15:00:00",
                        "date_to": "2010-03-26 09:14:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2008-07-08 15:00:00",
                        "date_to": "2010-03-26 09:14:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "2.7.0 Mar,31,2008"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2008-07-08 15:00:00",
                        "date_to": "2010-03-26 09:14:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2008-07-08 15:00:00",
                        "date_to": "2010-03-26 09:14:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "\/par\/lock\/notvis switched\r\nto \"on\".\r\nAdditional Number\r\nLGGD SN 0244 on the type level.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2010-03-26 09:15:00",
                "date_to": "2011-02-15 14:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2010-03-26 09:15:00",
                        "date_to": "2011-02-15 14:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "TPS E_GGD"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2010-03-26 09:15:00",
                        "date_to": "2011-02-15 14:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "AFY49G7RSHS"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2010-03-26 09:15:00",
                        "date_to": "2011-02-15 14:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2010-03-26 09:15:00",
                        "date_to": "2011-02-15 14:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.4 Dec,12,2009 p2"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2010-03-26 09:15:00",
                        "date_to": "2011-02-15 14:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2010-03-26 09:15:00",
                        "date_to": "2011-02-15 14:59:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2011-02-15 15:00:00",
                "date_to": "2011-11-11 11:30:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2011-02-15 15:00:00",
                        "date_to": "2011-11-11 11:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2011-02-15 15:00:00",
                        "date_to": "2011-11-11 11:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3VOLU2Z8ZA2O83VVUCM"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2011-02-15 15:00:00",
                        "date_to": "2011-11-11 11:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2011-02-15 15:00:00",
                        "date_to": "2011-11-11 11:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.1.7 MAY,31,2010"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2011-02-15 15:00:00",
                        "date_to": "2011-11-11 11:30:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2011-02-15 15:00:00",
                        "date_to": "2011-11-11 11:30:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2011-11-11 12:00:00",
                "date_to": "2011-12-12 14:29:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2011-11-11 12:00:00",
                        "date_to": "2011-12-12 14:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2011-11-11 12:00:00",
                        "date_to": "2011-12-12 14:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3VOLU2Z8ZA2O83VVUCM"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2011-11-11 12:00:00",
                        "date_to": "2011-12-12 14:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2011-11-11 12:00:00",
                        "date_to": "2011-12-12 14:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.2.7 MAY,16,2011"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2011-11-11 12:00:00",
                        "date_to": "2011-12-12 14:29:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2011-11-11 12:00:00",
                        "date_to": "2011-12-12 14:29:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2011-12-12 14:30:00",
                "date_to": "2012-03-29 14:29:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2011-12-12 14:30:00",
                        "date_to": "2012-03-29 14:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2011-12-12 14:30:00",
                        "date_to": "2012-03-29 14:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3VOLU2Z8ZA2O83VVUCM"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2011-12-12 14:30:00",
                        "date_to": "2012-03-29 14:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2011-12-12 14:30:00",
                        "date_to": "2012-03-29 14:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.3.5 NOV,16,2011"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2011-12-12 14:30:00",
                        "date_to": "2012-03-29 14:29:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2011-12-12 14:30:00",
                        "date_to": "2012-03-29 14:29:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2012-03-29 14:30:00",
                "date_to": "2012-04-03 07:19:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2012-03-29 14:30:00",
                        "date_to": "2012-04-03 07:19:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2012-03-29 14:30:00",
                        "date_to": "2012-04-03 07:19:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3VOLU2Z8ZA2O83VVUCM"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2012-03-29 14:30:00",
                        "date_to": "2012-04-03 07:19:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2012-03-29 14:30:00",
                        "date_to": "2012-04-03 07:19:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.4.1 MAR,13,2012"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2012-03-29 14:30:00",
                        "date_to": "2012-04-03 07:19:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2012-03-29 14:30:00",
                        "date_to": "2012-04-03 07:19:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2012-04-03 07:20:00",
                "date_to": "2012-07-09 08:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2012-04-03 07:20:00",
                        "date_to": "2012-07-09 08:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2012-04-03 07:20:00",
                        "date_to": "2012-07-09 08:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3VOLU2Z8ZA2O83VVUCM"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2012-04-03 07:20:00",
                        "date_to": "2012-07-09 08:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2012-04-03 07:20:00",
                        "date_to": "2012-07-09 08:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.3.8 MAR,20,2012"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2012-04-03 07:20:00",
                        "date_to": "2012-07-09 08:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2012-04-03 07:20:00",
                        "date_to": "2012-07-09 08:59:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2012-07-09 09:00:00",
                "date_to": "2012-10-29 14:34:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2012-07-09 09:00:00",
                        "date_to": "2012-10-29 14:34:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2012-07-09 09:00:00",
                        "date_to": "2012-10-29 14:34:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3VOLU2Z8ZA2O83VVUCMB"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2012-07-09 09:00:00",
                        "date_to": "2012-10-29 14:34:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2012-07-09 09:00:00",
                        "date_to": "2012-10-29 14:34:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.3.8 MAR,20,2012"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2012-07-09 09:00:00",
                        "date_to": "2012-10-29 14:34:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2012-07-09 09:00:00",
                        "date_to": "2012-10-29 14:34:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2012-10-29 14:35:00",
                "date_to": "2012-12-10 08:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2012-10-29 14:35:00",
                        "date_to": "2012-12-10 08:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2012-10-29 14:35:00",
                        "date_to": "2012-12-10 08:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3VOLU2Z8ZA2O83VVUCMB"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2012-10-29 14:35:00",
                        "date_to": "2012-12-10 08:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2012-10-29 14:35:00",
                        "date_to": "2012-12-10 08:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.4.6 OCT,15,2012"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2012-10-29 14:35:00",
                        "date_to": "2012-12-10 08:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2012-10-29 14:35:00",
                        "date_to": "2012-12-10 08:59:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Firmware Beta Version\r\n3.4.7B2 E19 DEC,06,2012",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2012-12-10 09:00:00",
                "date_to": "2012-12-27 10:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2012-12-10 09:00:00",
                        "date_to": "2012-12-27 10:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2012-12-10 09:00:00",
                        "date_to": "2012-12-27 10:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3VOLU2Z8ZA2O83VVUCMB"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2012-12-10 09:00:00",
                        "date_to": "2012-12-27 10:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2012-12-10 09:00:00",
                        "date_to": "2012-12-27 10:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.4.7B2 E19 DEC,06,2"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2012-12-10 09:00:00",
                        "date_to": "2012-12-27 10:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2012-12-10 09:00:00",
                        "date_to": "2012-12-27 10:59:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2012-12-27 11:00:00",
                "date_to": "2013-01-11 10:14:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2012-12-27 11:00:00",
                        "date_to": "2013-01-11 10:14:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2012-12-27 11:00:00",
                        "date_to": "2013-01-11 10:14:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3VOLU2Z8ZA2O83VVUCMB"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2012-12-27 11:00:00",
                        "date_to": "2013-01-11 10:14:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2012-12-27 11:00:00",
                        "date_to": "2013-01-11 10:14:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.4.7 DEC,26,2012"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2012-12-27 11:00:00",
                        "date_to": "2013-01-11 10:14:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2012-12-27 11:00:00",
                        "date_to": "2013-01-11 10:14:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Full Receiver ID\r\nSerial Number is\r\n01NFLYCNP1TST041CQ9JN5ND0C.\r\nAdditional Number\r\nSN 01344 on the type level.\r\nOEM 1253264.\r\nBoard TRE_G3TH_8.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2013-01-11 10:15:00",
                "date_to": "2013-02-19 10:44:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2013-01-11 10:15:00",
                        "date_to": "2013-02-19 10:44:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2013-01-11 10:15:00",
                        "date_to": "2013-02-19 10:44:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "01344"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2013-01-11 10:15:00",
                        "date_to": "2013-02-19 10:44:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2013-01-11 10:15:00",
                        "date_to": "2013-02-19 10:44:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.4.7 DEC,26,2012"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2013-01-11 10:15:00",
                        "date_to": "2013-02-19 10:44:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2013-01-11 10:15:00",
                        "date_to": "2013-02-19 10:44:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Full Receiver ID\r\nSerial Number is\r\n01NFLYCNP1TST041CQ9JN5ND0C.\r\nAdditional Number\r\nSN 01344 on the type level.\r\nOEM 1253264.\r\nBoard TRE_G3TH_8.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2013-02-19 10:45:00",
                "date_to": "2013-10-31 08:44:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2013-02-19 10:45:00",
                        "date_to": "2013-10-31 08:44:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2013-02-19 10:45:00",
                        "date_to": "2013-10-31 08:44:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "01344"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2013-02-19 10:45:00",
                        "date_to": "2013-10-31 08:44:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2013-02-19 10:45:00",
                        "date_to": "2013-10-31 08:44:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.5.1B2 FEB,14,2013"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2013-02-19 10:45:00",
                        "date_to": "2013-10-31 08:44:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2013-02-19 10:45:00",
                        "date_to": "2013-10-31 08:44:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Full Receiver ID\r\nSerial Number is\r\n01NFLYCNP1TST041CQ9JN5ND0C.\r\nAdditional Number\r\nSN 01344 on the type level.\r\nOEM 1253264.\r\nBoard TRE_G3TH_8.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2013-10-31 08:45:00",
                "date_to": "2014-04-17 08:49:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2013-10-31 08:45:00",
                        "date_to": "2014-04-17 08:49:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2013-10-31 08:45:00",
                        "date_to": "2014-04-17 08:49:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "01344"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2013-10-31 08:45:00",
                        "date_to": "2014-04-17 08:49:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2013-10-31 08:45:00",
                        "date_to": "2014-04-17 08:49:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.5.3 SEP,19,2013"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2013-10-31 08:45:00",
                        "date_to": "2014-04-17 08:49:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2013-10-31 08:45:00",
                        "date_to": "2014-04-17 08:49:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Full Receiver ID\r\nSerial Number is\r\n01NFLYCNP1TST041CQ9JN5ND0C.\r\nAdditional Number\r\nSN 01344 on the type level.\r\nOEM 1253264.\r\nBoard TRE_G3TH_8.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2014-04-17 08:50:00",
                "date_to": "2014-08-14 11:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2014-04-17 08:50:00",
                        "date_to": "2014-08-14 11:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2014-04-17 08:50:00",
                        "date_to": "2014-08-14 11:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "01344"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2014-04-17 08:50:00",
                        "date_to": "2014-08-14 11:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2014-04-17 08:50:00",
                        "date_to": "2014-08-14 11:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.5.5 MAR,03,2014"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2014-04-17 08:50:00",
                        "date_to": "2014-08-14 11:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2014-04-17 08:50:00",
                        "date_to": "2014-08-14 11:59:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Full Receiver ID\r\nSerial Number is\r\n01NFLYCNP1TST041CQ9JN5ND0C.\r\nAdditional Number\r\nSN 01344 on the type level.\r\nOEM 1253264.\r\nBoard TRE_G3TH_8.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2014-08-14 12:00:00",
                "date_to": "2015-01-27 08:14:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2014-08-14 12:00:00",
                        "date_to": "2015-01-27 08:14:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2014-08-14 12:00:00",
                        "date_to": "2015-01-27 08:14:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "01344"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2014-08-14 12:00:00",
                        "date_to": "2015-01-27 08:14:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2014-08-14 12:00:00",
                        "date_to": "2015-01-27 08:14:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.6.0 JUN,23,2014"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2014-08-14 12:00:00",
                        "date_to": "2015-01-27 08:14:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2014-08-14 12:00:00",
                        "date_to": "2015-01-27 08:14:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Full Receiver ID\r\nSerial Number is\r\n01NFLYCNP1TST041CQ9JN5ND0C.\r\nAdditional Number\r\nSN 01344 on the type level.\r\nOEM 1253264.\r\nBoard TRE_G3TH_8.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2015-01-27 08:15:00",
                "date_to": "2015-06-16 08:39:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2015-01-27 08:15:00",
                        "date_to": "2015-06-16 08:39:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2015-01-27 08:15:00",
                        "date_to": "2015-06-16 08:39:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "01344"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2015-01-27 08:15:00",
                        "date_to": "2015-06-16 08:39:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2015-01-27 08:15:00",
                        "date_to": "2015-06-16 08:39:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.6.1 DEC,30,2014"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2015-01-27 08:15:00",
                        "date_to": "2015-06-16 08:39:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2015-01-27 08:15:00",
                        "date_to": "2015-06-16 08:39:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Full Receiver ID\r\nSerial Number is\r\n01NFLYCNP1TST041CQ9JN5ND0C.\r\nAdditional Number\r\nSN 01344 on the type level.\r\nOEM 1253264.\r\nBoard TRE_G3TH_8.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2015-06-16 08:40:00",
                "date_to": "2015-11-20 12:10:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2015-06-16 08:40:00",
                        "date_to": "2015-11-20 12:10:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2015-06-16 08:40:00",
                        "date_to": "2015-11-20 12:10:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "01344"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2015-06-16 08:40:00",
                        "date_to": "2015-11-20 12:10:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2015-06-16 08:40:00",
                        "date_to": "2015-11-20 12:10:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.6.2 APR,08,2015"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2015-06-16 08:40:00",
                        "date_to": "2015-11-20 12:10:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2015-06-16 08:40:00",
                        "date_to": "2015-11-20 12:10:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Full Receiver ID\r\nSerial Number is\r\n01NFLYCNP1TST041CQ9JN5ND0C.\r\nAdditional Number\r\nSN 01344 on the type level.\r\nOEM 1253264.\r\nBoard TRE_G3TH_8.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2015-11-20 12:15:00",
                "date_to": "2015-11-26 12:29:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2015-11-20 12:15:00",
                        "date_to": "2015-11-26 12:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2015-11-20 12:15:00",
                        "date_to": "2015-11-26 12:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "01344"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2015-11-20 12:15:00",
                        "date_to": "2015-11-26 12:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2015-11-20 12:15:00",
                        "date_to": "2015-11-26 12:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.6.3 JUL,01,2015"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2015-11-20 12:15:00",
                        "date_to": "2015-11-26 12:29:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2015-11-20 12:15:00",
                        "date_to": "2015-11-26 12:29:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Full Receiver ID\r\nSerial Number is\r\n01NFLYCNP1TST041CQ9JN5ND0C.\r\nAdditional Number\r\nSN 01344 on the type level.\r\nOEM 1253264.\r\nBoard TRE_G3TH_8.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2015-11-26 12:30:00",
                "date_to": "2016-02-16 08:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2015-11-26 12:30:00",
                        "date_to": "2016-02-16 08:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2015-11-26 12:30:00",
                        "date_to": "2016-02-16 08:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "01344"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2015-11-26 12:30:00",
                        "date_to": "2016-02-16 08:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2015-11-26 12:30:00",
                        "date_to": "2016-02-16 08:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.6.4B1-57-AB7E NOV,"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2015-11-26 12:30:00",
                        "date_to": "2016-02-16 08:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2015-11-26 12:30:00",
                        "date_to": "2016-02-16 08:59:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Full Receiver ID\r\nSerial Number is\r\n01NFLYCNP1TST041CQ9JN5ND0C.\r\nAdditional Number\r\nSN 01344 on the type level.\r\nOEM 1253264.\r\nBoard TRE_G3TH_8.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2016-02-16 09:00:00",
                "date_to": "2016-05-19 08:29:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2016-02-16 09:00:00",
                        "date_to": "2016-05-19 08:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2016-02-16 09:00:00",
                        "date_to": "2016-05-19 08:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "01344"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2016-02-16 09:00:00",
                        "date_to": "2016-05-19 08:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2016-02-16 09:00:00",
                        "date_to": "2016-05-19 08:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.6.4 JAN,12,2016"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2016-02-16 09:00:00",
                        "date_to": "2016-05-19 08:29:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2016-02-16 09:00:00",
                        "date_to": "2016-05-19 08:29:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Full Receiver ID\r\nSerial Number is\r\n01NFLYCNP1TST041CQ9JN5ND0C.\r\nAdditional Number\r\nSN 01344 on the type level.\r\nOEM 1253264.\r\nBoard TRE_G3TH_8.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2016-05-19 08:30:00",
                "date_to": "2017-01-12 16:54:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2016-05-19 08:30:00",
                        "date_to": "2017-01-12 16:54:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2016-05-19 08:30:00",
                        "date_to": "2017-01-12 16:54:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "01344"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2016-05-19 08:30:00",
                        "date_to": "2017-01-12 16:54:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2016-05-19 08:30:00",
                        "date_to": "2017-01-12 16:54:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.6.6 APR,27,2016"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2016-05-19 08:30:00",
                        "date_to": "2017-01-12 16:54:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2016-05-19 08:30:00",
                        "date_to": "2017-01-12 16:54:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Full Receiver ID\r\nSerial Number is\r\n01NFLYCNP1TST041CQ9JN5ND0C.\r\nAdditional Number\r\nSN 01344 on the type level.\r\nOEM 1253264.\r\nBoard TRE_G3TH_8.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2017-01-12 16:55:00",
                "date_to": "2017-09-08 14:30:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2017-01-12 16:55:00",
                        "date_to": "2017-09-08 14:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2017-01-12 16:55:00",
                        "date_to": "2017-09-08 14:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "01344"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2017-01-12 16:55:00",
                        "date_to": "2017-09-08 14:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2017-01-12 16:55:00",
                        "date_to": "2017-09-08 14:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.6.9 NOV,28,2016"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2017-01-12 16:55:00",
                        "date_to": "2017-09-08 14:30:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2017-01-12 16:55:00",
                        "date_to": "2017-09-08 14:30:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2017-09-08 14:31:00",
                "date_to": "2019-01-18 10:40:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2017-09-08 14:31:00",
                        "date_to": "2019-01-18 10:40:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2017-09-08 14:31:00",
                        "date_to": "2019-01-18 10:40:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "01344"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2017-09-08 14:31:00",
                        "date_to": "2019-01-18 10:40:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+IRNSS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2017-09-08 14:31:00",
                        "date_to": "2019-01-18 10:40:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.7.2 AUG,31,2017"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2017-09-08 14:31:00",
                        "date_to": "2019-01-18 10:40:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2017-09-08 14:31:00",
                        "date_to": "2019-01-18 10:40:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2019-01-18 10:45:00",
                "date_to": "2019-01-24 14:40:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2019-01-18 10:45:00",
                        "date_to": "2019-01-24 14:40:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2019-01-18 10:45:00",
                        "date_to": "2019-01-24 14:40:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "01344"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2019-01-18 10:45:00",
                        "date_to": "2019-01-24 14:40:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+IRNSS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2019-01-18 10:45:00",
                        "date_to": "2019-01-24 14:40:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.7.5 DEC,06,2018"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2019-01-18 10:45:00",
                        "date_to": "2019-01-24 14:40:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2019-01-18 10:45:00",
                        "date_to": "2019-01-24 14:40:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2019-01-24 14:50:00",
                "date_to": "2019-02-01 09:30:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2019-01-24 14:50:00",
                        "date_to": "2019-02-01 09:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2019-01-24 14:50:00",
                        "date_to": "2019-02-01 09:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "01344"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2019-01-24 14:50:00",
                        "date_to": "2019-02-01 09:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+IRNSS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2019-01-24 14:50:00",
                        "date_to": "2019-02-01 09:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.7.5p1 Jan,23,2019"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2019-01-24 14:50:00",
                        "date_to": "2019-02-01 09:30:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2019-01-24 14:50:00",
                        "date_to": "2019-02-01 09:30:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "IRNSS again added on 2019-03-14",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2019-02-01 13:30:00",
                "date_to": "2019-04-11 10:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2019-02-01 13:30:00",
                        "date_to": "2019-04-11 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_3 DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2019-02-01 13:30:00",
                        "date_to": "2019-04-11 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "02911"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2019-02-01 13:30:00",
                        "date_to": "2019-04-11 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+IRNSS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2019-02-01 13:30:00",
                        "date_to": "2019-04-11 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.7.5P1 JAN,23,2019"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2019-02-01 13:30:00",
                        "date_to": "2019-04-11 10:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2019-02-01 13:30:00",
                        "date_to": "2019-04-11 10:00:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2019-04-11 10:15:00",
                "date_to": "2020-01-24 13:45:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2019-04-11 10:15:00",
                        "date_to": "2020-01-24 13:45:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_3 DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2019-04-11 10:15:00",
                        "date_to": "2020-01-24 13:45:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "02911"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2019-04-11 10:15:00",
                        "date_to": "2020-01-24 13:45:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+IRNSS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2019-04-11 10:15:00",
                        "date_to": "2020-01-24 13:45:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.7.6 APR,08,2019"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2019-04-11 10:15:00",
                        "date_to": "2020-01-24 13:45:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2019-04-11 10:15:00",
                        "date_to": "2020-01-24 13:45:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2020-01-24 13:50:00",
                "date_to": "2021-02-18 11:30:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2020-01-24 13:50:00",
                        "date_to": "2021-02-18 11:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_3 DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2020-01-24 13:50:00",
                        "date_to": "2021-02-18 11:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "02911"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2020-01-24 13:50:00",
                        "date_to": "2021-02-18 11:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2020-01-24 13:50:00",
                        "date_to": "2021-02-18 11:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.7.9 DEC,30,2019"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2020-01-24 13:50:00",
                        "date_to": "2021-02-18 11:30:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2020-01-24 13:50:00",
                        "date_to": "2021-02-18 11:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2021-02-18 11:35:00",
                "date_to": "2021-06-02 14:45:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2021-02-18 11:35:00",
                        "date_to": "2021-06-02 14:45:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_3 DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2021-02-18 11:35:00",
                        "date_to": "2021-06-02 14:45:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "02911"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2021-02-18 11:35:00",
                        "date_to": "2021-06-02 14:45:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2021-02-18 11:35:00",
                        "date_to": "2021-06-02 14:45:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "4.0.02-210208"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2021-02-18 11:35:00",
                        "date_to": "2021-06-02 14:45:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2021-02-18 11:35:00",
                        "date_to": "2021-06-02 14:45:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2021-06-02 14:50:00",
                "date_to": "2021-09-01 11:50:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2021-06-02 14:50:00",
                        "date_to": "2021-09-01 11:50:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_3 DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2021-06-02 14:50:00",
                        "date_to": "2021-09-01 11:50:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "02911"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2021-06-02 14:50:00",
                        "date_to": "2021-09-01 11:50:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2021-06-02 14:50:00",
                        "date_to": "2021-09-01 11:50:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "4.1.01-210527"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2021-06-02 14:50:00",
                        "date_to": "2021-09-01 11:50:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2021-06-02 14:50:00",
                        "date_to": "2021-09-01 11:50:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2021-09-01 12:00:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2021-09-01 12:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_3 DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2021-09-01 12:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "02911"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2021-09-01 12:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+IRNSS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2021-09-01 12:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "4.1.03-210713"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2021-09-01 12:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2021-09-01 12:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1998-10-18 00:00:00",
                "date_to": "2003-06-10 11:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "antenna_type"
                        },
                        "date_from": "1998-10-18 00:00:00",
                        "date_to": "2003-06-10 11:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "ASH701073.1"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1998-10-18 00:00:00",
                        "date_to": "2003-06-10 11:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "CRG0106"
                    },
                    {
                        "attribute": {
                            "name": "antenna_reference_point"
                        },
                        "date_from": "1998-10-18 00:00:00",
                        "date_to": "2003-06-10 11:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "BPA"
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_up_ecc"
                        },
                        "date_from": "1998-10-18 00:00:00",
                        "date_to": "2003-06-10 11:00:00",
                        "value_date": null,
                        "value_numeric": 0.064,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_north_ecc"
                        },
                        "date_from": "1998-10-18 00:00:00",
                        "date_to": "2003-06-10 11:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_east_ecc"
                        },
                        "date_from": "1998-10-18 00:00:00",
                        "date_to": "2003-06-10 11:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "alignment_from_true_n"
                        },
                        "date_from": "1998-10-18 00:00:00",
                        "date_to": "2003-06-10 11:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_type"
                        },
                        "date_from": "1998-10-18 00:00:00",
                        "date_to": "2003-06-10 11:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "RG 214"
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_length"
                        },
                        "date_from": "1998-10-18 00:00:00",
                        "date_to": "2003-06-10 11:00:00",
                        "value_date": null,
                        "value_numeric": 30,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "antenna"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1998-10-18 00:00:00",
                "date_to": "2003-06-10 11:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "radome_type"
                        },
                        "date_from": "1998-10-18 00:00:00",
                        "date_to": "2003-06-10 11:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "SNOW"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1998-10-18 00:00:00",
                        "date_to": "2003-06-10 11:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "radome"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2003-06-10 11:00:00",
                "date_to": "2011-02-04 10:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "antenna_type"
                        },
                        "date_from": "2003-06-10 11:00:00",
                        "date_to": "2011-02-04 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "TPSCR3_GGD"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2003-06-10 11:00:00",
                        "date_to": "2011-02-04 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "217-0112"
                    },
                    {
                        "attribute": {
                            "name": "antenna_reference_point"
                        },
                        "date_from": "2003-06-10 11:00:00",
                        "date_to": "2011-02-04 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "BPA"
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_up_ecc"
                        },
                        "date_from": "2003-06-10 11:00:00",
                        "date_to": "2011-02-04 10:00:00",
                        "value_date": null,
                        "value_numeric": 0.215,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_north_ecc"
                        },
                        "date_from": "2003-06-10 11:00:00",
                        "date_to": "2011-02-04 10:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_east_ecc"
                        },
                        "date_from": "2003-06-10 11:00:00",
                        "date_to": "2011-02-04 10:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "alignment_from_true_n"
                        },
                        "date_from": "2003-06-10 11:00:00",
                        "date_to": "2011-02-04 10:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_type"
                        },
                        "date_from": "2003-06-10 11:00:00",
                        "date_to": "2011-02-04 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "RG 214"
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_length"
                        },
                        "date_from": "2003-06-10 11:00:00",
                        "date_to": "2011-02-04 10:00:00",
                        "value_date": null,
                        "value_numeric": 30,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "antenna"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2003-06-10 11:00:00",
                "date_to": "2011-02-04 10:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "radome_type"
                        },
                        "date_from": "2003-06-10 11:00:00",
                        "date_to": "2011-02-04 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "CONE"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2003-06-10 11:00:00",
                        "date_to": "2011-02-04 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "radome"
                }
            }
        },
        {
            "item": {
                "comment": "Antenna and radome calibrated\r\nby Geo++ GmbH Garbsen, 2010-08-11,\r\nand by University Bonn, 2010-12-03.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2011-02-04 10:01:00",
                "date_to": "2015-07-13 09:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "antenna_type"
                        },
                        "date_from": "2011-02-04 10:01:00",
                        "date_to": "2015-07-13 09:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEIAR25.R3"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2011-02-04 10:01:00",
                        "date_to": "2015-07-13 09:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "10240011"
                    },
                    {
                        "attribute": {
                            "name": "antenna_reference_point"
                        },
                        "date_from": "2011-02-04 10:01:00",
                        "date_to": "2015-07-13 09:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "BPA"
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_up_ecc"
                        },
                        "date_from": "2011-02-04 10:01:00",
                        "date_to": "2015-07-13 09:59:00",
                        "value_date": null,
                        "value_numeric": 0.045,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_north_ecc"
                        },
                        "date_from": "2011-02-04 10:01:00",
                        "date_to": "2015-07-13 09:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_east_ecc"
                        },
                        "date_from": "2011-02-04 10:01:00",
                        "date_to": "2015-07-13 09:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "alignment_from_true_n"
                        },
                        "date_from": "2011-02-04 10:01:00",
                        "date_to": "2015-07-13 09:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_type"
                        },
                        "date_from": "2011-02-04 10:01:00",
                        "date_to": "2015-07-13 09:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "RG 214"
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_length"
                        },
                        "date_from": "2011-02-04 10:01:00",
                        "date_to": "2015-07-13 09:59:00",
                        "value_date": null,
                        "value_numeric": 30,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "antenna"
                }
            }
        },
        {
            "item": {
                "comment": "Antenna and radome calibrated\r\nby Geo++ GmbH Garbsen, 2010-08-11,\r\nand by University Bonn, 2010-12-03.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2011-02-04 10:01:00",
                "date_to": "2015-07-13 09:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "radome_type"
                        },
                        "date_from": "2011-02-04 10:01:00",
                        "date_to": "2015-07-13 09:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEIT"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2011-02-04 10:01:00",
                        "date_to": "2015-07-13 09:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "radome"
                }
            }
        },
        {
            "item": {
                "comment": "Antenna and radome calibrated\r\nby Geo++ GmbH Garbsen, 2010-08-11,\r\nand by University Bonn, 2010-12-03.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2015-07-13 10:00:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "antenna_type"
                        },
                        "date_from": "2015-07-13 10:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEIAR25.R3"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2015-07-13 10:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "10240011"
                    },
                    {
                        "attribute": {
                            "name": "antenna_reference_point"
                        },
                        "date_from": "2015-07-13 10:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "BPA"
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_up_ecc"
                        },
                        "date_from": "2015-07-13 10:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0.284,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_north_ecc"
                        },
                        "date_from": "2015-07-13 10:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_east_ecc"
                        },
                        "date_from": "2015-07-13 10:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "alignment_from_true_n"
                        },
                        "date_from": "2015-07-13 10:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_type"
                        },
                        "date_from": "2015-07-13 10:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "RG 214"
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_length"
                        },
                        "date_from": "2015-07-13 10:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 30,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "antenna"
                }
            }
        },
        {
            "item": {
                "comment": "Antenna and radome calibrated\r\nby Geo++ GmbH Garbsen, 2010-08-11,\r\nand by University Bonn, 2010-12-03.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2015-07-13 10:00:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "radome_type"
                        },
                        "date_from": "2015-07-13 10:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEIT"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2015-07-13 10:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "radome"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1999-02-01 00:00:00",
                "date_to": "2007-06-28 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
                        },
                        "date_from": "1999-02-01 00:00:00",
                        "date_to": "2007-06-28 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "INTERNAL"
                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
                        },
                        "date_from": "1999-02-01 00:00:00",
                        "date_to": "2007-06-28 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
                }
            }
        },
        {
            "item": {
                "comment": "Use H-Maser EFOS 18 for external\r\ninput reference.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2007-06-28 00:00:00",
                "date_to": "2010-05-12 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
                        },
                        "date_from": "2007-06-28 00:00:00",
                        "date_to": "2010-05-12 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "EXTERNAL H-MASER EFOS 18"
                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
                        },
                        "date_from": "2007-06-28 00:00:00",
                        "date_to": "2010-05-12 00:00:00",
                        "value_date": null,
                        "value_numeric": 5,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2010-05-12 00:00:00",
                "date_to": "2011-02-15 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
                        },
                        "date_from": "2010-05-12 00:00:00",
                        "date_to": "2011-02-15 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "INTERNAL"
                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
                        },
                        "date_from": "2010-05-12 00:00:00",
                        "date_to": "2011-02-15 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2011-02-15 00:00:00",
                "date_to": "2019-02-01 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
                        },
                        "date_from": "2011-02-15 00:00:00",
                        "date_to": "2019-02-01 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "EXTERNAL H-MASER EFOS 18"
                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
                        },
                        "date_from": "2011-02-15 00:00:00",
                        "date_to": "2019-02-01 00:00:00",
                        "value_date": null,
                        "value_numeric": 5,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2019-02-01 00:00:00",
                "date_to": "2019-03-14 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
                        },
                        "date_from": "2019-02-01 00:00:00",
                        "date_to": "2019-03-14 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "INTERNAL"
                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
                        },
                        "date_from": "2019-02-01 00:00:00",
                        "date_to": "2019-03-14 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2019-03-14 00:00:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
                        },
                        "date_from": "2019-03-14 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "EXTERNAL H-MASER EFOS 18"
                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
                        },
                        "date_from": "2019-03-14 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 5,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
                }
            }
        },
        {
            "item": {
                "comment": "Meteorological data Site WTZR",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1987-01-01 00:00:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "sensor_model"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "809"
                    },
                    {
                        "attribute": {
                            "name": "manufacturer"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "Lamprecht, Goettingen"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "data_sampling_interval"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 900,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "accuracy"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 1.5,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "aspiration"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "PERNIX element"
                    },
                    {
                        "attribute": {
                            "name": "height_diff_to_ant"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "calibration_date"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "humidity_sensor"
                }
            }
        },
        {
            "item": {
                "comment": "Meteorological data Site WTZR.\r\nThe Pressure Sensor is 10.5 m\r\nbelow the antenna.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1987-01-01 00:00:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "sensor_model"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "DIGIQUARZ MODEL 740"
                    },
                    {
                        "attribute": {
                            "name": "manufacturer"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "Parascientific Inc."
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "data_sampling_interval"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 900,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "accuracy"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0.1,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "height_diff_to_ant"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 10.5,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "calibration_date"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "pressure_sensor"
                }
            }
        },
        {
            "item": {
                "comment": "Meteorological data Site WTZR",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1987-01-01 00:00:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "sensor_model"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "809"
                    },
                    {
                        "attribute": {
                            "name": "manufacturer"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "Lamprecht, Goettingen"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "data_sampling_interval"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 900,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "accuracy"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0.3,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "aspiration"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "PLATINUM PROBE"
                    },
                    {
                        "attribute": {
                            "name": "height_diff_to_ant"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "calibration_date"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "temperature_sensor"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1997-04-15 00:00:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "sensor_model"
                        },
                        "date_from": "1997-04-15 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "CTGR129502"
                    },
                    {
                        "attribute": {
                            "name": "manufacturer"
                        },
                        "date_from": "1997-04-15 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "Captec, Bern \/ ETH, Zuerich"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1997-04-15 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "distance_to_antenna"
                        },
                        "date_from": "1997-04-15 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 27,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "height_diff_to_ant"
                        },
                        "date_from": "1997-04-15 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 1,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "calibration_date"
                        },
                        "date_from": "1997-04-15 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "water_vapor_radiometer"
                }
            }
        }
    ],
    "station_networks": [
        {
            "name": "EPN"
        },
        {
            "name": "EPOS"
        },
        {
            "name": "IGS"
        }
    ],
    "station_type": "GNSS Continuous"
}