IPC Subgroup
H04Q 3/74 Identification of subscriber calling from a party-line
Introduced: September 1968
Last revised: January 2006
Full Title
Selecting arrangements > Finding out and indicating number of calling subscriber > Identification of subscriber calling from a party-line
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- SELECTING