F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F04 POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
F04B POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
1/00 Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
F04B1/04 having cylinders in star- or fan-arrangement