Full Title

Rotary-piston pumps specially adapted for elastic fluids (with fluid ring or the like F04C19/00; rotary-piston pumps in which the working-fluid is exclusively displaced by one or more reciprocating pistons F04B) > Rotary-piston pumps with non-parallel axes of movement of co-operating members > the axes being arranged otherwise than at an angle of 90 degrees > of intermeshing engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing