【机械工程】旋转活塞发动机、振动活塞发动机【机械工程；照明；加热；武】爆破，燃烧室；旋转的活塞式发动机、振动活塞式发动机

rotary-piston pump

spindle drag pump (spiral pump) rotary-piston pump

intermeshing engagement and intermeshing engagement in rotary-piston machines or engines

multi-stage rotary-piston pump

spring pump rotary-piston pump

combination of rotary-piston pumps with oscillating-piston pumps

rotary vane pump rotary-piston pump

combination with rotary-piston pumps