THE HISTORY OF THE TELEPHONE

By !5cowej

  • Radio telephone

    To trans fer sound to a radio for comunacation

  • Marine vhf radio

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