IPC Subgroup
H04M 15/2 Operator's time recording or indicating arrangements
Introduced: September 1968
Last revised: January 2006
Full Title
Arrangements for metering, time-control or time-indication > Metering calls from calling party > Discriminative metering > according to duration of call > Operator's time recording or indicating arrangements
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION