each machine piston having channels that coact with the cylinder and serve as distribution members for another piston-cylinder unit

Full Title

Multi-cylinder machines or pumps characterised by number or arrangement of cylinders (machines or pumps with pistons coacting within one cylinder F04B3/00) > having cylinders in star- or fan-arrangement > with actuating or actuated elements at the inner ends of the cylinders > with cam-actuated distribution members > each machine piston having channels that coact with the cylinder and serve as distribution members for another piston-cylinder unit