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    theresa posted an update 8 months, 3 weeks ago

    How Elevators Work – New Electronic Tubes Control Elevator Function 1940s
    http://www.luloot.com/elearning/how-elevators-work-new-electronic-tubes-control-elevator-function-1940s_c22c9b06a.html
    Elevators and their new electronic controls – 1940s. Invented by Elisha Otis…

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