【机械工程】活塞式传动装置【机械工程，照明，加热，武器，爆破】活塞式齿轮

piston

solid-skirt piston

differential pump (multistage pump, multi-cellular pump, step piston pump)

rotary-piston pump

oscillating-piston pump

differential piston-type switch

refuse vehicle with charging piston

radial-flow piston machine or pump, variable displacement pump,