Call transmitter for the input of control commands,...
Call-routing device
Canonical telephone numbers
Card system
Card-like device having a microprocessor and speaker for communi
CAS tone disguising method and apparatus
Cellular car telephone dialing controller
Circuit and method for automatic memory dialing
Circuit arrangement for generating an acoustic ringing signal in
Circuit for surge voltage protection in electronic telephone sta
Circuit for transmitting voice signals and dial pulses
Combined writing and signaling instrument
Communication apparatus
Communication apparatus
Communication apparatus
Communication apparatus for automatic dialing from a separate te
Communication apparatus with facilities for changing to a pulse
Communication apparatus with stored sets of destination and...
Communication device
Communication device