IPC Subgroup
H04M 1/667 Preventing unauthorised calls from a telephone set
Introduced: January 2000
Last revised: January 2006
Full Title
Substation equipment, e.g. for use by subscribers > with means for preventing unauthorised or fraudulent calling > Preventing unauthorised calls from a telephone set
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION
1 direct subcode
Child Classifications
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- H04M 1/67 by electronic means