Rotary-piston pumps with non-parallel axes of movement of co-operating members

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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

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• F04C 18/50 the axes being arranged at an angle of 90 degrees
• F04C 18/54 the axes being arranged otherwise than at an angle of 90 degrees