#calculating_machine__calculatingmachine__calculator  a small machine that is used for mathematical calculations
  supertype:  machine  any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks
  subtype:  abacus  a calculator that performs arithmetic functions by manually sliding counters on rods or in grooves
  subtype:  adder  a machine that adds
  subtype:  adding_machine__totalizer__totaliser  a calculator that performs simple arithmetic functions
  subtype:  tabulator__counter  a calculator that keeps a record of the number of times something happens
     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
  subtype:  hand_calculator__pocket_calculator  a calculator small enough to hold in the hand or carry in a pocket
  subtype:  Napier's_bones__Napier's_rods  a set of graduated rods formerly used to do multiplication and division by a method invented by John Napier
  subtype:  quipu  calculator consisting of a cord with attached cords; used by ancient Peruvians for calculating and keeping records
  subtype:  subtracter  a machine that subtracts

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