仰转驴头抽油装置

pump (fan, ventilator, blower), rotary pump

rotary motor of the vane type for liquids

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

combination of rotary-piston pumps with oscillating-piston pumps

rotary-piston pump oscillating-piston pump

electrically driven rotary sidewall sampler

rotary-type stitching machine bookbinding

rotary-type admission control vane rotary-piston pump