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  2. Model 500 telephone - Wikipedia

    en.wikipedia.org/wiki/Model_500_telephone

    The Western Electric model 500 telephone series was the standard domestic desk telephone set issued by the Bell System in North America from 1950 through the 1984 Bell System divestiture. The successor to the model 302 telephone , the model 500's modular construction compared to previous types simplified manufacture and repair and facilitated a ...

  3. Bell System Practices - Wikipedia

    en.wikipedia.org/wiki/Bell_System_Practices

    A typical volume of Bell System Practices from the 1970s. The Bell System Practices (BSPs) is a compilation of technical publications which describes the best methods of engineering, constructing, installing, and maintaining the telephone plant of the Bell System under direction of AT&T and Bell Telephone Laboratories. [1]

  4. Rotary dial - Wikipedia

    en.wikipedia.org/wiki/Rotary_dial

    A 220 Trimline rotary desk phone, showing the innovative rotary dial with moving fingerstop Some telephones include a small dial built into the handset, with a movable finger stop. The user rotates the dial clockwise until the finger stop ceases moving, then releases both.

  5. Trimline telephone - Wikipedia

    en.wikipedia.org/wiki/Trimline_telephone

    A 220 Trimline rotary desk phone, showing the innovative rotary dial with moving fingerstop Early Touch Tone Trimline with round buttons and clear plastic backplate and round non-modular handset cord Redesigned touch-tone desk model Trimline, manufactured on January 9, 1985 The Trimline 2225, one of the last phones made at the Indianapolis Works in 1986 Early foreign made Trimline, December ...

  6. Model 302 telephone - Wikipedia

    en.wikipedia.org/wiki/Model_302_telephone

    The model 302 telephone is a desk set telephone that was manufactured in the United States by Western Electric from 1937 until 1955, and by Northern Electric in Canada until the late 1950s, until well after the introduction of the 500-type telephone in 1949. The sets were routinely refurbished into the 1960s.

  7. List of telephone switches - Wikipedia

    en.wikipedia.org/wiki/List_of_telephone_switches

    AN/TTC-22 100 Line Automatic/Manual Military Tactical Switch (retired) ... CS2100 (230,000 ports, 125,000 IP phones, 150,000 ... The line switches will also talk to ...

  8. Design Line telephone - Wikipedia

    en.wikipedia.org/wiki/Design_Line_telephone

    In 1985, AT&T Technologies redesigned its consumer telephone products to be cheaper to build and be more competitive in the marketplace by adding electronic ringers and a redial function. In 1986, they moved telephone production out of the United States. After this time several new Design Line series telephones were marketed and discontinued.

  9. Western Electric hand telephone sets - Wikipedia

    en.wikipedia.org/wiki/Western_Electric_hand...

    The first version of the new hand telephone sets was marked by AT&T as D-76869, a specification type for small quantities of new equipment. The device was described by George K. Thompson of the American Telephone and Telegraph Company (AT&T) in United States patent No. 1508424 of 1924, without showing the handset that was still in development. [10]

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