DIFF Subgroup
F04B 27/0873 Full Title
Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders (multi-stage pumps specially adapted for elastic fluids F04B25/00) > having cylinders coaxial with, or parallel or inclined to, main shaft axis
Of 3 combined children, 0 exist in both systems.
3 codes are CPC-only extensions.