DIFF Subgroup
H04Q 3/62 for connecting to private branch exchanges
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Selecting arrangements > Arrangements providing connection between main exchange and sub-exchange or satellite > for connecting to private branch exchanges
CPC:
Selecting arrangements (H04Q5/00 - H04Q11/00 take precedence) > Arrangements providing connection between main exchange and sub-exchange or satellite > for connecting to private branch exchanges
Of 2 combined children, 0 exist in both systems.
2 codes are CPC-only extensions.
Child Classifications
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