#radio__wireless  a communication system based on broadcasting electromagnetic waves
  supertype:  #communication_system__communicationsystem  a system for communicating
  subtype:  #wireless_telegraph  the use of radio to send telegraphic messages (usually by Morse code)
  part:  #radio_receiver__radioreceiver__receiving_set__receivingset__radio_set__radioset__radio__tuner__wireless  an electronic receiver that detects and demodulates and amplifies transmitted signals
     part:  #amplifier  electronic equipment that increases strength of signals passing through it
     part:  #detector  electronic equipment that detects the presence of radio signals or radioactivity
     part:  #demodulator  rectifier that extracts modulation from a radio carrier wave
  part:  #radio_transmitter__radiotransmitter  transmitter that is the part of a radio system that transmits signals

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