H04M 3/2254 — IPC vs CPC Diff | Patent Classification Explorer

DIFF Subgroup

H04M 3/2254

Full Title

Automatic or semi-automatic exchanges > Arrangements for supervision, monitoring or testing

Of 1 combined children, 0 exist in both systems.

1 codes are CPC-only extensions.

This code exists only in CPC.

Diff view requires codes present in both systems.