IPC Subgroup
H04M 1/2 Arrangements for preventing acoustic feedback
Introduced: September 1968
Last revised: January 2006
Full Title
Substation equipment, e.g. for use by subscribers > Constructional features of telephone sets > Arrangements for preventing acoustic feedback
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION