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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "A Schlenk flask, or Schlenk tube is a reaction vessel typically used in air sensitive chemistry, invented by Wilhelm Schlenk. It has a side arm fitted with a PTFE or ground glass stopcock which allows the vessel to be evacuated or filled with gases (usually inert gases like nitrogen or argon)." ] ,
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