#detector  electronic equipment that detects the presence of radio signals or radioactivity
  supertype:  electronic_equipment  equipment that involves the controlled conduction of electrons (especially in a gas or vacuum or semiconductor)
  subtype:  crystal_detector  electronic_scanner
  part of:  radio_receiver__radioreceiver__receiving_set__receivingset__radio_set__radioset__radio__tuner__wireless  an electronic receiver that detects and demodulates and amplifies transmitted signals
     part of:  radio__wireless  a communication system based on broadcasting electromagnetic waves
     part of:  radio-phonograph__radiophonograph__radio-gramophone__radiogramophone  electronic equipment consisting of a combination of a radio receiver and a record player
        part of:  audio_system__audiosystem__sound_system__soundsystem  a system of electronic equipment for recording or reproducing sound

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