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

Full Title

Substation equipment, e.g. for use by subscribers (subscriber services or facilities provided at exchanges H04M3/00; prepayment telephone coin boxes H04M17/00; current supply arrangements H04M19/08) > 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
• H04M 1/30 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