Telephonic communication systems specially adapted for combination with other electrical systems

Child Classifications

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• H04M 11/002 +1 CPC CPC only CPC only
• H04M 11/007 CPC only CPC only
• H04M 11/02 with bell or annunciator systems +3 CPC IPC+CPC Available in IPC and CPC
• H04M 11/04 with alarm systems, e.g. fire, police or burglar alarm systems +1 CPC IPC+CPC Available in IPC and CPC
• H04M 11/06 Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors +4 CPC IPC+CPC Available in IPC and CPC
• H04M 11/08 specially adapted for optional reception of entertainment or informative matter +1 CPC IPC+CPC Available in IPC and CPC
• H04M 11/10 with dictation recording and playback systems IPC+CPC Available in IPC and CPC