Devices for calling a subscriber (H04M1/66 takes precedence)

Child Classifications

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• H04M 1/27 Devices whereby a plurality of signals may be stored simultaneously since 1974 +1 CPC IPC+CPC Available in IPC and CPC
• H04M 1/30 Devices which can set up and transmit only one digit at a time IPC+CPC Available in IPC and CPC
• 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 since 1974 IPC+CPC Available in IPC and CPC
• H04M 1/52 Arrangements wherein a dial or the like is mechanically coupled to a line selector IPC+CPC Available in IPC and CPC
• H04M 1/53 Generation of additional signals, e.g. additional pulses since 1974 IPC+CPC Available in IPC and CPC