#piston_chamber__cylinder  a chamber within which piston moves
  supertype:  #chamber  a natural or artificial enclosed space
  part:  #intake_valve
  part of:  #compressor  #engine_block  #pump
  subtype:  #hydraulic_brake_cylinder__hydraulicbrakecylinder__brake_cylinder__brakecylinder__master_cylinder  a cylinder that contains brake fluid that is compressed by a piston

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