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    { "id" : "http://dbpedia.org/resource/Optical_microscope"
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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "The optical microscope, often referred to as light microscope, is a type of microscope which uses visible light and a system of lenses to magnify images of small samples. Optical microscopes are the oldest design of microscope and were possibly invented in their present compound form in the 17th century. Basic optical microscopes can be very simple, although there are many complex designs which aim to improve resolution and sample contrast." ] ,
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          "http://dbpedia.org/resource/History_of_optics" ] ,
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