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DIFF Subgroup
H04M 3/38

Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections (queuing arrangements H04Q3/64)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections

CPC: Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections (queuing arrangements H04Q3/64)

Full Title

Full titles differ between systems:

IPC:

Automatic or semi-automatic exchanges > Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections

CPC:

Automatic or semi-automatic exchanges > Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections (queuing arrangements H04Q3/64)

Of 2 combined children, 0 exist in both systems.

2 codes are CPC-only extensions.

Child Classifications

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