H04M 9/022 — IPC vs CPC Diff | Patent Classification Explorer

DIFF Subgroup

H04M 9/022

Full Title

Arrangements for interconnection not involving centralised switching > involving a common line for all parties

Of 2 combined children, 0 exist in both systems.

2 codes are CPC-only extensions.

This code exists only in CPC.

Diff view requires codes present in both systems.