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  "temporalCoverage": "1850/1870",
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      "name": "metaal",
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    {
      "@type": "Product",
      "name": "glas"
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  ],
  "creator": {
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    "creator": {
      "@type": "Organization",
      "name": "Troughton & Simms"
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    "address": "Londen, VK",
    "latitude": 51.50853,
    "longitude": -0.12574,
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    "unitCode": "MMT",
    "value": 215
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  "width": {
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    "unitCode": "MMT",
    "value": 410
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  "citation": "Bruff, Peter, \"A Treatise on Engineering Field Work : Containing Practical Land Surveying for Railways, &c. : With the Theory, Principles, and Practice of Levelling, and Their Application to the Purposes of Civil Engineering : Also Parish and Subterranean Surveying, with Sectio-Planography, and Every Information Necessary to Be Known in the Elementary Parts of Civil Engineering : With Descriptions of the Best Instruments Employed in Surveying and Levelling, Their Adjustments and Methods of Using in the Field\", London: Simpkin, Marshall, 1838.",
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