IPC Subgroup
H04M 15/26 with a meter at the exchange controlled by an operator
Introduced: September 1968
Last revised: January 2006
Full Title
Arrangements for metering, time-control or time-indication > Metering calls from calling party > with a meter at the exchange controlled by an operator
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION