THE HISTORY OF THE TELEPHONE

By !5cowej
  • Marine vhf radio

    Allowed people to phone a ship in the middle of the sea
  • Radio telephone

    To trans fer sound to a radio for comunacation
  • Period: to

    THE TELEPHONE

  • Walkie talkie

    A motor roller invented a back pack
  • Mobile telephonesystem

    A call set-up required a manual operation by a mobile operator
  • Rotary Dial

    Networked by a MTA
    (mobile Telephone system A)
  • Cellular network

    To spread connections over the nations
  • Dual-tone multi-frequency signaling (DTMF)

    16 keys with difernt tones for each number
  • Improved telephone service

    Automatic public telephone network
  • acoustic coupler

    A wireless phone signalled by an acoustic coupler
  • Handheld cell phone

    A phone installed in cars that are able to receive calls while traveling