DIFF Subgroup
H04Q 3/54 in which the logic circuitry controlling the exchange is centralised
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Selecting arrangements > Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker > in which the logic circuitry controlling the exchange is centralised
CPC:
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
Of 3 combined children, 2 exist in both systems.
1 codes are CPC-only extensions.
IPC defines codes here since 1985.
Child Classifications
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