#oscillator  generator that produces sonic oscillations or alternating current
  supertype:  generator.electronic_device  an electronic device for producing a signal voltage
  subtype:  crystal_oscillator__crystaloscillator__quartz_oscillator  an oscillator that produces electrical oscillations at a frequency determined by the physical characteristics of a piezoelectric quartz crystal
  subtype:  local_oscillator__localoscillator__heterodyne_oscillator  an oscillator whose output heterodynes with the incoming radio signal to produce sum and difference tones

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