#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)
  part of:  #radio_receiver
  subtype:  #crystal_detector__crystaldetector  a detector consisting of a fine wire in contact with a galena crystal; acts as a rectifier
  subtype:  #electronic_scanner__scanner  an electronic detector that scans automatically for some signal or condition; "they used scanners to monitor police radio channels"

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