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- rotary-piston machine or engine, with coaxial axes
- rotary-piston machine or engine, with helical teeth
- rotary-piston machine or engine, with parallel axes
- rotary-piston machine or pump
- rotary-piston machine or pump machine or pump of internal-axis type
- rotary-piston machine steam, fluid, gas
- rotary piston meter
- rotary-piston meter measurement of volume flow
- rotary piston motor
- rotary-piston or oscillating-piston machine orengine
- rotary-piston-, oscilating-pistonl-combustion engine
- rotary-piston-, oscillating-piston-combustion engine
- rotary-piston pump
- rotarypiston pump
- rotary piston pump
- rotary-piston pump axis, vertical
- rotary-piston pump for gases or vapours
- rotary-piston pump of arcuate-engagement type
- rotary-piston pump of intermeshing-engagement type
- rotary-piston pump of internal-engagement type
- rotary-piston pump oscillating-piston pump
- rotary-piston pump (rotary-piston compressor)
- rotary-piston pump (rotating plunger pump) rotary-piston pump
- rotary-piston pump with arcuate engagement and relative reciprocation between co-operating
- rotary-piston pump with arcuate, slip engagement and relative reciprocation between co-op
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