with a rotary cylinder with a single piston reciprocating within the cylinder

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 > the cylinders being movable, e.g. rotary > with actuating or actuated elements at the inner ends of the cylinders > with rotary cylinder blocks > with a rotary cylinder with a single piston reciprocating within the cylinder