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                "item_attributes": [
                    {
                        "attribute": {
                            "name": "antenna_type"
                        },
                        "date_from": "1999-06-02 00:40:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "ASH701073.1"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1999-06-02 00:40:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "CRG0117"
                    },
                    {
                        "attribute": {
                            "name": "antenna_reference_point"
                        },
                        "date_from": "1999-06-02 00:40:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "BPA"
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_up_ecc"
                        },
                        "date_from": "1999-06-02 00:40:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_north_ecc"
                        },
                        "date_from": "1999-06-02 00:40:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_east_ecc"
                        },
                        "date_from": "1999-06-02 00:40:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "alignment_from_true_n"
                        },
                        "date_from": "1999-06-02 00:40:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_type"
                        },
                        "date_from": "1999-06-02 00:40:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_length"
                        },
                        "date_from": "1999-06-02 00:40:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "antenna"
                }
            }
        },
        {
            "item": {
                "comment": "COMBINED GPS & GLONASS ANTENNA.\r\nGNSS antenna signal splitter was replaced 2021-09-27. Performance of new unit was not satisfactory and the old splitter returned to service 2021-10-08.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "NMA",
                        "address": "Kartverksveien 21 \/ P.O.Box 600 Sentrum\nN-3507 Honefoss\nNorway",
                        "infos": "",
                        "name": "Norwegian Mapping Authority",
                        "www": ""
                    },
                    "comment": "",
                    "email": "satref@kartverket.no",
                    "name": "SATREF Control Centre",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "NMA",
                        "address": "Kartverksveien 21 \/ P.O.Box 600 Sentrum\nN-3507 Honefoss\nNorway",
                        "infos": "",
                        "name": "Norwegian Mapping Authority",
                        "www": ""
                    },
                    "comment": "",
                    "email": "satref@kartverket.no",
                    "name": "SATREF Control Centre",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1999-06-02 00:40:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "radome_type"
                        },
                        "date_from": "1999-06-02 00:40:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "SNOW"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1999-06-02 00:40:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "unknown"
                    }
                ],
                "item_type": {
                    "name": "radome"
                }
            }
        },
        {
            "item": {
                "comment": "SAME CLOCK USED FOR VLBI",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "NMA",
                        "address": "Kartverksveien 21 \/ P.O.Box 600 Sentrum\nN-3507 Honefoss\nNorway",
                        "infos": "",
                        "name": "Norwegian Mapping Authority",
                        "www": ""
                    },
                    "comment": "",
                    "email": "satref@kartverket.no",
                    "name": "SATREF Control Centre",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "NMA",
                        "address": "Kartverksveien 21 \/ P.O.Box 600 Sentrum\nN-3507 Honefoss\nNorway",
                        "infos": "",
                        "name": "Norwegian Mapping Authority",
                        "www": ""
                    },
                    "comment": "",
                    "email": "satref@kartverket.no",
                    "name": "SATREF Control Centre",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1997-06-01 00:00:00",
                "date_to": "2009-05-13 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
                        },
                        "date_from": "1997-06-01 00:00:00",
                        "date_to": "2009-05-13 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "EXTERNAL H-MASER"
                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
                        },
                        "date_from": "1997-06-01 00:00:00",
                        "date_to": "2009-05-13 00:00:00",
                        "value_date": null,
                        "value_numeric": 5,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
                }
            }
        },
        {
            "item": {
                "comment": "TEMPORARY DUE TO FREQUENCY ISSUES",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "NMA",
                        "address": "Kartverksveien 21 \/ P.O.Box 600 Sentrum\nN-3507 Honefoss\nNorway",
                        "infos": "",
                        "name": "Norwegian Mapping Authority",
                        "www": ""
                    },
                    "comment": "",
                    "email": "satref@kartverket.no",
                    "name": "SATREF Control Centre",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "NMA",
                        "address": "Kartverksveien 21 \/ P.O.Box 600 Sentrum\nN-3507 Honefoss\nNorway",
                        "infos": "",
                        "name": "Norwegian Mapping Authority",
                        "www": ""
                    },
                    "comment": "",
                    "email": "satref@kartverket.no",
                    "name": "SATREF Control Centre",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2009-05-13 00:00:00",
                "date_to": "2009-07-10 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
                        },
                        "date_from": "2009-05-13 00:00:00",
                        "date_to": "2009-07-10 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "INTERNAL"
                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
                        },
                        "date_from": "2009-05-13 00:00:00",
                        "date_to": "2009-07-10 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
                }
            }
        },
        {
            "item": {
                "comment": "SAME CLOCK USED FOR VLBI, 5 MHz via Symmetricon frequency doubler\/distributer\r\nIt is unknown when this clock source was disabled, end date is a guess",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "NMA",
                        "address": "Kartverksveien 21 \/ P.O.Box 600 Sentrum\nN-3507 Honefoss\nNorway",
                        "infos": "",
                        "name": "Norwegian Mapping Authority",
                        "www": ""
                    },
                    "comment": "",
                    "email": "satref@kartverket.no",
                    "name": "SATREF Control Centre",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "NMA",
                        "address": "Kartverksveien 21 \/ P.O.Box 600 Sentrum\nN-3507 Honefoss\nNorway",
                        "infos": "",
                        "name": "Norwegian Mapping Authority",
                        "www": ""
                    },
                    "comment": "",
                    "email": "satref@kartverket.no",
                    "name": "SATREF Control Centre",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2009-07-10 00:00:00",
                "date_to": "2012-01-01 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
                        },
                        "date_from": "2009-07-10 00:00:00",
                        "date_to": "2012-01-01 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "EXTERNAL H-MASER"
                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
                        },
                        "date_from": "2009-07-10 00:00:00",
                        "date_to": "2012-01-01 00:00:00",
                        "value_date": null,
                        "value_numeric": 10,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
                }
            }
        },
        {
            "item": {
                "comment": "Start date is unknown (best guess)",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "NMA",
                        "address": "Kartverksveien 21 \/ P.O.Box 600 Sentrum\nN-3507 Honefoss\nNorway",
                        "infos": "",
                        "name": "Norwegian Mapping Authority",
                        "www": ""
                    },
                    "comment": "",
                    "email": "satref@kartverket.no",
                    "name": "SATREF Control Centre",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "NMA",
                        "address": "Kartverksveien 21 \/ P.O.Box 600 Sentrum\nN-3507 Honefoss\nNorway",
                        "infos": "",
                        "name": "Norwegian Mapping Authority",
                        "www": ""
                    },
                    "comment": "",
                    "email": "satref@kartverket.no",
                    "name": "SATREF Control Centre",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2012-01-01 00:00:00",
                "date_to": "2021-02-01 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
                        },
                        "date_from": "2012-01-01 00:00:00",
                        "date_to": "2021-02-01 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "INTERNAL"
                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
                        },
                        "date_from": "2012-01-01 00:00:00",
                        "date_to": "2021-02-01 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
                }
            }
        },
        {
            "item": {
                "comment": "5 MHz H-maser signal via Symmetricon frequency doubler\/distributer",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "NMA",
                        "address": "Kartverksveien 21 \/ P.O.Box 600 Sentrum\nN-3507 Honefoss\nNorway",
                        "infos": "",
                        "name": "Norwegian Mapping Authority",
                        "www": ""
                    },
                    "comment": "",
                    "email": "satref@kartverket.no",
                    "name": "SATREF Control Centre",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "NMA",
                        "address": "Kartverksveien 21 \/ P.O.Box 600 Sentrum\nN-3507 Honefoss\nNorway",
                        "infos": "",
                        "name": "Norwegian Mapping Authority",
                        "www": ""
                    },
                    "comment": "",
                    "email": "satref@kartverket.no",
                    "name": "SATREF Control Centre",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2021-02-01 00:00:00",
                "date_to": "2021-09-24 10:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
                        },
                        "date_from": "2021-02-01 00:00:00",
                        "date_to": "2021-09-24 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "EXTERNAL H-MASER"
                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
                        },
                        "date_from": "2021-02-01 00:00:00",
                        "date_to": "2021-09-24 10:00:00",
                        "value_date": null,
                        "value_numeric": 10,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
                }
            }
        },
        {
            "item": {
                "comment": "Switching to internal due to H-maser instability",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "NMA",
                        "address": "Kartverksveien 21 \/ P.O.Box 600 Sentrum\nN-3507 Honefoss\nNorway",
                        "infos": "",
                        "name": "Norwegian Mapping Authority",
                        "www": ""
                    },
                    "comment": "",
                    "email": "satref@kartverket.no",
                    "name": "SATREF Control Centre",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "NMA",
                        "address": "Kartverksveien 21 \/ P.O.Box 600 Sentrum\nN-3507 Honefoss\nNorway",
                        "infos": "",
                        "name": "Norwegian Mapping Authority",
                        "www": ""
                    },
                    "comment": "",
                    "email": "satref@kartverket.no",
                    "name": "SATREF Control Centre",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2021-09-24 10:00:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
                        },
                        "date_from": "2021-09-24 10:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "INTERNAL"
                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
                        },
                        "date_from": "2021-09-24 10:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
                }
            }
        }
    ],
    "station_networks": [
        {
            "name": "EPN"
        },
        {
            "name": "EPOS"
        },
        {
            "name": "IGS"
        },
        {
            "name": "NMA-CORS"
        }
    ],
    "station_type": "GNSS Continuous"
}