IPC Subgroup
H04M 1/66 with means for preventing unauthorised or fraudulent calling
Introduced: September 1968
Last revised: January 2006
Full Title
Substation equipment, e.g. for use by subscribers > with means for preventing unauthorised or fraudulent calling
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION
Related Keywords
PREVENTING fraudulent or unauthorized calling
3 direct subcodes
Child Classifications
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- H04M 1/663 Preventing unauthorised calls to a telephone set
- H04M 1/667 Preventing unauthorised calls from a telephone set
- H04M 1/677 Preventing the dialling or sending of predetermined telephone numbers or selected types of telephone numbers, e.g. long distance numbers