DIFF Subgroup
H04Q 3/521 Full Title
Selecting arrangements (H04Q5/00 - H04Q11/00 take precedence) > Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker > using static devices in switching stages, e.g. electronic switching arrangements
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.