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- rotary-piston engine with toothed rotary pistons
- rotary piston gas meter
- rotary piston gas metre
- rotary piston gearing, hydrostatic
- rotary piston hydraulic motor
- rotary piston internal combustion engine
- rotary-piston internal-combustion engine, oscillating-piston
- rotary-piston internal-combustion engine, oscillating-piston internal-combustion engine
- rotary-piston internal-combustion machine, oscillating-piston
- rotary piston machine
- rotary-piston-machine or engine
- rotary-piston machine or engine
- rotary-piston machine or engine, arrangement
- rotary-piston machine or engine, arrangement of drive
- rotary-piston machine or engine, oscillating-piston engine
- rotary-piston machine or engine, oscillating-piston machine or engine
- rotary-piston machine or engine, with angular axes
- 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
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