a machine which compresses and circulates fluid, called rotary compressor
a machine used for compressing gas, called a centrifugal compressor
a device called {axial blower}
an electric motor with a device called commutator
a hydraulically-operated piston
a machine used to compress gas or air
an engine whose driving force is derived from the chemical reaction of jet fuel
both machinery and tools driven by oil pressure
a wheel used for transmitting motion by friction, called friction wheel