{ "items" : [
    { "id" : "http://dbpedia.org/resource/Cryotron"
      "properties" : {
        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "The cryotron is a switch that operates using superconductivity. The cryotron works on the principle that magnetic fields destroy superconductivity. This simple device consists of two superconducting wires (e.g. tantalum and niobium) with different critical temperature (Tc)."] } } }
