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    { "id" : "http://dbpedia.org/resource/Marine_chronometer"
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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "A marine chronometer is a timepiece that is precise and accurate enough to be used as a portable time standard; it can therefore be used to determine longitude by means of celestial navigation. When first developed in the 18th century, it was a major technical achievement, as accurate knowledge of the time over a long sea voyage is necessary for navigation, lacking electronic or communications aids." ] ,
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