DIFF Subgroup
G03G 15/221 Full Title
Apparatus for electrographic processes using a charge pattern (G03G16/00, G03G17/00 take precedence) > involving the combination of more than one step according to groups G03G13/02 - G03G13/20 (G03G15/01 takes precedence)
Of 3 combined children, 0 exist in both systems.
3 codes are CPC-only extensions.