DIFF Subgroup
H04Q 3/54575 Full Title
Selecting arrangements (H04Q5/00 - H04Q11/00 take precedence) > Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker > in which the logic circuitry controlling the exchange is centralised > using a stored program
Of 2 combined children, 0 exist in both systems.
2 codes are CPC-only extensions.