IPC Subgroup
H04M 5/18 Arrangements for signalling the class or number of called or calling line from one exchange to another
Introduced: September 1968
Last revised: January 2006
Full Title
Manual exchanges > Arrangements for signalling the class or number of called or calling line from one exchange to another
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION
1 direct subcode
Child Classifications
Navigate with arrow keys, Enter to open
- H04M 5/2 Arrangements for indicating the numbers of the incoming lines