IPC Subgroup
H04M 1/53 Generation of additional signals, e.g. additional pulses
Introduced: July 1974
Last revised: January 2006
Full Title
Substation equipment, e.g. for use by subscribers > Devices for calling a subscriber > Generation of additional signals, e.g. additional pulses
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION
1 direct subcode
Child Classifications
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- H04M 1/54 Arrangements wherein a dial or the like generates identifying signals, e.g. in party-line systems