IPC Subgroup
H04M 17/02 Coin-freed or check-freed systems
Introduced: September 1968
Last revised: January 2006
Full Title
Prepayment telephone systems > Coin-freed or check-freed systems
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION
Related Keywords
COIN(S) -freed apparatus in telephone systems