IPC Subgroup
H04M 1/26 Devices for calling a subscriber
Introduced: September 1968
Last revised: January 2006
Full Title
Substation equipment, e.g. for use by subscribers > Devices for calling a subscriber
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION
5 direct subcodes
Child Classifications
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- H04M 1/27 Devices whereby a plurality of signals may be stored simultaneously
- H04M 1/3 Devices which can set up and transmit only one digit at a time
- H04M 1/515 by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of DC signals of alternating polarity, coded pulses or impedance dialling
- H04M 1/52 Arrangements wherein a dial or the like is mechanically coupled to a line selector
- H04M 1/53 Generation of additional signals, e.g. additional pulses