CPC Main Group
H04M 11/00 Telephonic communication systems specially adapted for combination with other electrical systems
7 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- 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 11/10 with dictation recording and playback systems