【机械工程】振动活塞机或振动活塞引擎【机械工程】振荡-活塞机或发动机

oscillating-piston pump

multi-stage oscillating-piston pump

combination of rotary-piston pumps with oscillating-piston pumps

oscillating-piston machine

combination with oscillating-piston pumps

member, inner rotary-piston machine or engine, oscillating-piston machine or engine

rotary-piston pump oscillating-piston pump

rotary-piston machine or engine, oscillating-piston machine or engine