IPC Subgroup
H04M 19/06 in which current supply sources at subordinate switching centres are charged from the main exchange
Introduced: September 1968
Last revised: January 2006
Full Title
Current supply arrangements for telephone systems > in which current supply sources at subordinate switching centres are charged from the main exchange
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION