IPC Main Group
H04M 13/00 Party-line systems
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION
Scope Notes
Limiting references: Substation equipment Exchange equipment, automatic, manual , Metering arrangements
Related Keywords
telephonic PARTY-LINE