#pulse_generator__pulsegenerator  a generator of single or multiple voltage pulses; usually adjustable for pulse rate
  supertype:  #generator.electronic_device  an electronic device for producing a signal voltage
  subtype:  #pinger  a pulse generator used for echo sounding in sonar
  part of:  #microwave_radar__microwaveradar__radar__radio_detection_and_ranging__radiodetectionandranging__radiolocation  measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects
  part of:  #sonar__echo_sounder__asdic  a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return (sonar is SOund NAvigation Ranging; asdic is Anti-Submarine Detection Investigation Committee)
     part of:  #pigboat__submarine__sub__uboat  a submersible warship usually armed with torpedoes

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