IPC Main Group
H04M 17/00 Prepayment telephone systems
Introduced: September 1968
Last revised: January 2024
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION
Scope Notes
Limiting references: Preventing unauthorized calling from a telephone set by inserting a coded card | Application references: Accounting or billing specially adapted for wireless communication networks Usage measurements specially adapted for wireless communication networks
Related Keywords
telephone systems using PREPAYMENT
1 direct subcode
Child Classifications
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- H04M 17/02 Coin-freed or check-freed systems