Telephone

The Telephone

By emerbrannelly
  • 1st Telephone

    1st Telephone

    Alexander Graham Bell created the telephone
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  • Telephone can connect across major cites

    Telephone can connect across major cites

    *Aproxamate date
  • Fleming invents the vacuum diode

    Fleming invents the vacuum diode

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  • First transcontinental telephone call

    First transcontinental telephone call

    *Aproxamate date
  • Switching systems and rotary-dial telephones

    Switching systems and rotary-dial telephones

    *Aproxamate date
  • Frequency multiplexing concept

    Frequency multiplexing concept

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  • North American Numbering Plan

    North American Numbering Plan

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  • A Mathematical Theory of Communication

    A Mathematical Theory of Communication

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  • First phone to combine a ringer and handset

    First phone to combine a ringer and handset

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  • Direct longdistance calling first available

    Direct longdistance calling first available

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  • First transatlantic telephone cable

    First transatlantic telephone cable

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  • First commercial digital transmission system

    First commercial digital transmission system

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  • Telstar 1

    Telstar 1

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  • Touch-tone telephone is introduced

    Touch-tone telephone is introduced

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  • First electronic central office switching system

    First electronic central office switching system

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  • First Emergency call is made

    First Emergency call is made

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  • First portable mobile is made

    First portable mobile is made

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  • Common channel interoffice signaling

    Common channel interoffice signaling

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  • Public tests of a new cellular phone system

    Public tests of a new cellular phone system

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  • Voice Over Internet Protocols

    Voice Over Internet Protocols

    *Aproxamate date
  • 100 million cellular telephone subscribers

    100 million cellular telephone subscribers

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