http://dbpedia.org/resource/Tube_socket +
, http://dbpedia.org/resource/Magic_eye_tube +
, http://dbpedia.org/resource/Vacuum_tube +
, http://dbpedia.org/resource/Talaria_projector +
, http://dbpedia.org/resource/Beam_tetrode +
, http://dbpedia.org/resource/EF50 +
, http://dbpedia.org/resource/Acorn_tube +
, http://dbpedia.org/resource/Photomultiplier_tube +
, http://dbpedia.org/resource/Cathode-ray_tube +
, http://dbpedia.org/resource/Phototube +
, http://dbpedia.org/resource/Thermionic_emission +
, http://dbpedia.org/resource/Space_charge +
, http://dbpedia.org/resource/Williams_tube +
, http://dbpedia.org/resource/Getter +
, http://dbpedia.org/resource/Hot_cathode +
, http://dbpedia.org/resource/Pentagrid_converter +
, http://dbpedia.org/resource/RMA_tube_designation +
, http://dbpedia.org/resource/Glowing_plate +
, http://dbpedia.org/resource/Work_function +
, http://dbpedia.org/resource/Control_grid +
, http://dbpedia.org/resource/Plate_electrode +
, http://dbpedia.org/resource/Tetrode +
, http://dbpedia.org/resource/Audion +
, http://dbpedia.org/resource/Fleming_valve +
, http://dbpedia.org/resource/Nonode +
, http://dbpedia.org/resource/Russian_tube_designations +
, http://dbpedia.org/resource/Suppressor_grid +
, http://dbpedia.org/resource/Additron_tube +
, http://dbpedia.org/resource/Triode +
, http://dbpedia.org/resource/List_of_vacuum_tubes +
, http://dbpedia.org/resource/Mullard%E2%80%93Philips_tube_designation +
, http://dbpedia.org/resource/Pentode +
, http://dbpedia.org/resource/Selectron_tube +
, http://dbpedia.org/resource/Nuvistor +
, http://dbpedia.org/resource/List_of_Mullard%E2%80%93Philips_vacuum_tubes +
, http://dbpedia.org/resource/RETMA_tube_designation +
, http://dbpedia.org/resource/Beam_deflection_tube +
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