#microphone__mike  device for converting sound waves into electrical energy
  supertype:  #electro-acoustic_transducer  a transducer that converts electrical to acoustic energy or vice versa
  subtype:  #bug.microphone  a small hidden microphone; for listening secretly
  subtype:  #condenser_microphone__condensermicrophone__capacitor_microphone__capacitormicrophone  microphone consisting of a capacitor with one plate fixed and the other forming the diaphragm moved by sound waves
  subtype:  #crystal_microphone__crystalmicrophone  a microphone in which sound waves vibrate a piezoelectric crystal that generates a varying voltage

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