DIFF Subgroup
F02P 5/1502 Full Title
Advancing or retarding ignition; Control therefor > automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions (dependent on position of personal controls of engine F02P5/02) > using electrical means > Digital data processing
Of 7 combined children, 0 exist in both systems.
7 codes are CPC-only extensions.