#compressor  a mechanical device that compresses gasses
  supertype:  mechanical_device  mechanism consisting of a device that works on mechanical principles
  part:  piston_chamber
  subtype:  air_compressor__aircompressor  a compressor that takes in air at atmospheric pressure and delivers it at a higher pressure
  subtype:  supercharger  compressor that forces increased oxygen into the cylinders of an internal-combustion engine

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