{
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    "gnss": "https://gnss.be/vocab/2023/gnss#",
    "locn": "http://www.w3.org/ns/locn#",
    "odrl": "http://www.w3.org/ns/odrl/2/",
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    "vcard": "http://www.w3.org/2006/vcard/ns#",
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      "gnss:igsModelCode": "LEICA GR50"
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      "@type": "PeriodOfTime",
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      "gnss:igsModelCode": "LEIAR20         LEIM",
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      "gnss:marker-arpNorthEcc": {
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}