Description
Class F03C : POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
Subclass 1/03: Reciprocating-piston liquid engines with multiple cylinders, characterised by the number or arrangement of cylinders (with movable cylinders F03C 1/22; of flexible-wall type F03C 7/00) with movement in two directions being obtained by two single-acting piston liquid engines, each acting in one direction