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  2. Chamberlain Group - Wikipedia

    en.wikipedia.org/wiki/Chamberlain_Group

    Chamberlain, LiftMaster, and Craftsman have interchangeable parts, primarily the gear and circuit boards. The greatest difference between the brands is that Chamberlain and Craftsman operate on a square shaped split-rail system, while LiftMaster consists of one single solid piece of inverted t-shaped rail.

  3. Swing-door operator - Wikipedia

    en.wikipedia.org/wiki/Swing-door_operator

    To open the door, the operator forces the closer in the opening direction. Then, the closer closes the door. The user may open the door manually, using just the door closer. In case of power failure while the door is open, the closer itself closes the door. Some are built without a door closer. The motor opens and closes the door through ...

  4. Douglas DC-6 - Wikipedia

    en.wikipedia.org/wiki/Douglas_DC-6

    The rear cargo door came standard with a built in 4,000 lb (1,800 kg) lift elevator and a Jeep. The Jeep was a public relations stunt and shortly after, was dropped. [9] Slick Airways was the first airline to operate the freighter variant in April 1951. [10] DC-6B All-passenger variant of DC-6A, without cargo door.

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