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  3. Step by Step Switching or Strowger switching was the first automatic telephone system introduced by Almon B. Strowger. This system uses selectors for switching. The selectors used in Strowger exchange are mainly of two types Uniselector Two motion selector. Both the selectors belong to the same types of switches called rotary switches.
    www.daenotes.com/electronics/communication-sys…
    The step-by-step telephone switching system (as it is known in the Bell Telephone System; the “Strowger” system elsewhere) was the earliest “mechanized” telephone switching system to receive broad acceptance, and it remained important for many decades.
    dougkerr.net/Pumpkin/articles/SXS_Overview.pdf
     
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  5. AT&T Archives: The Step-By-Step Switch - YouTube

  6. Strowger switch - Wikipedia

  7. Electromechanical Telephone-Switching - ETHW

    WEB1) In the Strowger switch, pulses generated at a subscriber’s telephone directly moved electromagnetic contacts in a two-way motion in a stack of rotary contacts, thus selecting a telephone number, one digit at a time, …

  8. The Line Finder In The Step-By-Step Telephone Switching System

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  10. Survey of Telephone Switching - Introduction and …

    WEBBy 1892, the first commercial installation of automatic switching equipment using step-by-step mechanism was made at La Porte, Indiana. Though the rotary dial was developed in 1896, many of the early systems did not …

  11. Step by Step Switching or Strowger Switching - D&E …

    WEBStep by Step Switching or Strowger switching was the first automatic telephone system introduced by Almon B. Strowger. This system uses selectors for switching. The selectors used in Strowger exchange are …

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