DIFF Subgroup
F02B 23/0618 Full Title
Other engines characterised by special shape or construction of combustion chambers to improve operation (engines with incandescent chambers F02B9/08) > with compression ignition > the combustion space being arranged in working piston (F02B23/04 takes precedence)
Of 4 combined children, 0 exist in both systems.
4 codes are CPC-only extensions.