IPC Subgroup
H04M 3/24 with provision for checking the normal operation
Introduced: September 1968
Last revised: January 2006
Full Title
Automatic or semi-automatic exchanges > Arrangements for supervision, monitoring or testing > with provision for checking the normal operation
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION