{ "items" : [
    { "id" : "http://dbpedia.org/resource/Tetrode"
      "properties" : {
        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "A tetrode is a vacuum tube having four active electrodes. There are several varieties of tetrode with screen-grid tube, and the beam tetrode being the most common. The four electrodes in order from the centre are: a thermionic cathode, first and second grids and a plate. In screen-grid tubes and beam tetrodes, the first grid is the control grid and the second grid is the screen grid." ] ,
        "http://xmlns.com/foaf/0.1/depiction" : [ "http://commons.wikimedia.org/wiki/Special:FilePath/4-1000A_linear_RF_deck_build_by_K5LAD.jpg" ] ,
        "http://dbpedia.org/ontology/thumbnail" : [ "http://commons.wikimedia.org/wiki/Special:FilePath/4-1000A_linear_RF_deck_build_by_K5LAD.jpg?width=300"] } } }
