IPC Subgroup
H04M 5/16 with means for reducing interference; with means for reducing effects due to line faults
Introduced: September 1968
Last revised: January 2006
Full Title
Manual exchanges > with means for reducing interference; with means for reducing effects due to line faults
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION