Manual exchanges (substation equipment in general H04M1/00)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Manual exchanges

CPC: Manual exchanges (substation equipment in general H04M1/00)

Full titles differ between systems:

IPC:

Manual exchanges

CPC:

Manual exchanges (substation equipment in general H04M1/00)

Substation equipment in general

IPC and CPC are identically structured here. All 8 subcodes exist in both systems.

1 shared codes have differing titles between IPC and CPC.

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H04M 5/02 Constructional details (jacks, jack-plugs H01R24/58) IPC+CPC Available in IPC and CPC
H04M 5/04 Arrangements for indicating calls or supervising connections for calling or clearing IPC+CPC Available in IPC and CPC
H04M 5/08 using connecting means other than cords IPC+CPC Available in IPC and CPC
H04M 5/10 using separate plug for each subscriber IPC+CPC Available in IPC and CPC
H04M 5/12 Calling substations, e.g. by ringing IPC+CPC Available in IPC and CPC
H04M 5/14 Applications of speech amplifiers IPC+CPC Available in IPC and CPC
H04M 5/16 with means for reducing interference; with means for reducing effects due to line faults IPC+CPC Available in IPC and CPC
H04M 5/18 Arrangements for signalling the class or number of called or calling line from one exchange to another IPC+CPC Available in IPC and CPC

Class H04,2013–2023, worldwide · Source: EPO PATSTAT

Class H04,2013–2023, worldwide · Source: EPO PATSTAT