#pressure_gauge  gauge for measuring and indicating fluid pressure
  supertype:  #gauge__gage  a measuring instrument for measuring and indicating a quantity or for testing conformity with a standard
  subtype:  #manometer  a pressure gauge for comparing pressures of a gas
     subtype:  #tensimeter  a manometer for measuring vapor pressure
  subtype:  #sphygmomanometer  a pressure gauge for measuring blood pressure

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