The patent 474,230 was granted, after a 15-year delay because of litigation.In addition, many computer software vendors and telephony operators provide softphone application software that emulates a telephone by use of an attached microphone and audio headset, or loud speaker.Each pulse lasts approximately one-tenth of a second; the number of pulses signals the number being dialed.

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Isbn John, Richard R (2010 Network Nation: Inventing American Telecommunications, Harvard University Press, 2010; traces the evolution of the country's telegraph and telephone networks.As the distance across the granules fluctuated, resistance to the electric current also fluctuated, and the resulting variations in current were transmitted to the receiver.For technologies related to the telephone, see the articles mobile telephone, videophone, fax and modem.

Bell signs and notarizes his patent application for the telephone.University of Michigan: Scarecrow Press.Watsoncome hereI want to see you.