history of technology

By hmarshall

  • telephones

    telephones
    Alexander Graham Bell invented the Telephone in 1874

  • Wireless phone

    Wireless phone
    Nathan B. Stubblefield introduced the Wireless phone.

  • cordless phones

    cordless phones
    in 1970s the first cordless phone was introduced.the first tone-touch system that use tone in the voice frequency range in 1941.Granting a greater frequency range allowed cordless phones to have less interference and need less power to run.

  • MOTOROLA: the first cellphone

    MOTOROLA: the first cellphone
    The first cellular phone was invented and demsonstrated in 1973, by MArtin Cooper.using the prototype Motorola Dyna-Tac.

  • BLACKBERRY

    BLACKBERRY
    the first blackberry was lauched in 1999