#tabulator__counter  a calculator that keeps a record of the number of times something happens
  supertype:  #calculating_machine__calculatingmachine__calculator  a small machine that is used for mathematical calculations
  subtype:  #pulse_counter__pulsecounter  an electronic counter that counts the number of electric pulses
     subtype:  #scaler  an electronic pulse counter used to count pulses that occur too rapidly to be recorded individually

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