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                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
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                        "date_to": "2026-03-11 10:14:00",
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                        "value_varchar": "4.5.00-241014"
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                        "date_from": "2025-05-15 07:00:00",
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                        "value_numeric": 0,
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                        "attribute": {
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                        "value_numeric": null,
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                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
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                "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": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "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": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "metadata_custodian",
                    "title": ""
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                "date_from": "2026-03-11 10:14:00",
                "date_to": null,
                "item_attributes": [
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                        "value_varchar": "03025"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
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                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
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                ],
                "item_type": {
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                }
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        },
        {
            "item": {
                "comment": "Antenna type listed in this section retro-\nactively changed from JPSREGANT_SD_E to\nJPSREGANT_SD_E2 starting with log file\nffmj_20121007.log. See IGSMAIL-6662 and\nIGSMAIL-6663 for details.",
                "contact_as_owner": {
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                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
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                        "www": ""
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                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
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                    "role": "site_owner",
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                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "metadata_custodian",
                    "title": ""
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                "date_from": "2002-02-18 12:00:00",
                "date_to": "2005-05-19 08:00:00",
                "item_attributes": [
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                        "attribute": {
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                        "date_to": "2005-05-19 08:00:00",
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                        "value_numeric": null,
                        "value_varchar": "BPA"
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                        "value_numeric": 0,
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                        "value_numeric": 0,
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                        "value_numeric": 0,
                        "value_varchar": null
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                        "value_numeric": null,
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                ],
                "item_type": {
                    "name": "antenna"
                }
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        },
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            "item": {
                "comment": "Antenna type listed in this section retro-\nactively changed from JPSREGANT_SD_E to\nJPSREGANT_SD_E2 starting with log file\nffmj_20121007.log. See IGSMAIL-6662 and\nIGSMAIL-6663 for details.",
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                    "email": "operator.gref@bkg.bund.de",
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                    "role": "site_owner",
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                    "name": "GREF Operator",
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                    "role": "metadata_custodian",
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                "date_to": "2005-05-19 08:00:00",
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                "date_to": "2008-02-20 11:00:00",
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                        "value_varchar": "BPA"
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                    },
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                ],
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                "contact_as_owner": {
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                        "abbreviation": "BKG",
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                        "infos": "",
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                    "email": "operator.gref@bkg.bund.de",
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                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
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                    "role": "metadata_custodian",
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                "item_attributes": [
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                        "attribute": {
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                "date_to": "2011-02-08 10:00:00",
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                        "value_varchar": "BPA"
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            "item": {
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                        "abbreviation": "BKG",
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                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
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                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
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                    "role": "site_owner",
                    "title": ""
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                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2008-02-20 11:00:00",
                "date_to": "2011-02-08 10:00:00",
                "item_attributes": [
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                        "attribute": {
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                        "date_from": "2008-02-20 11:00:00",
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                        "value_varchar": null
                    }
                ],
                "item_type": {
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            }
        },
        {
            "item": {
                "comment": "Antenna individual\ncalibrated absolute at Geo++",
                "contact_as_owner": {
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                        "abbreviation": "BKG",
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}