IPC Main Group
H04M 11/00 Telephonic communication systems specially adapted for combination with other electrical systems
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION
5 direct subcodes
Child Classifications
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- H04M 11/02 with bell or annunciator systems
- H04M 11/04 with alarm systems, e.g. fire, police or burglar alarm systems
- H04M 11/06 Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
- H04M 11/08 specially adapted for optional reception of entertainment or informative matter
- H04M 11/1 with dictation recording and playback systems