DIFF Subgroup
G09B 29/003 Full Title
Maps; Plans; Charts; Diagrams, e.g. route diagram (star maps G09B27/04; devices for holding or supporting maps A47B97/02; for computing purposes G06G1/14, G09B1/16; display boards G09F)
Of 3 combined children, 0 exist in both systems.
3 codes are CPC-only extensions.