#analog_computer__analogue_computer  a computer that represents information by variable quantities (e.g., positions or voltages)
  supertype:  electronic_computer__computer__computing_machine__computingmachine__computing_device__computingdevice__data_processor__information_processing_system  a machine for performing calculations automatically
  subtype:  differential_analyzer  an analog computer designed to solve differential equations
  subtype:  slide_rule__sliderule__slipstick  analog computer consisting of a handheld instrument used for rapid calculations; have been replaced by pocket calculators

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