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  2. Yale (company) - Wikipedia

    en.wikipedia.org/wiki/Yale_(company)

    By 1929, Yale & Towne became the largest locks and door closer manufacturer in the world, and established an exclusive showroom for its products in the newly built Chrysler Building in New York. [10] During World War I , like number of manufacturers, Yale became involved in arms production . [ 10 ]

  3. dormakaba - Wikipedia

    en.wikipedia.org/wiki/Dormakaba

    dormakaba Holding AG (former Kaba Holding AG) is a global security group based in Rümlang, Switzerland. It employs more than 15,000 people in over 50 countries. It formed as the result of a merger between former Kaba and former Dorma in September 2015 and is publicly traded on the SIX Swiss Exchange. [5]

  4. Door closer - Wikipedia

    en.wikipedia.org/wiki/Door_closer

    A door closer is a mechanical device that regulates the speed and action of a door’s swing. [1] Manual closers store the force used to open the door in some type of spring and reuse it to close the door. Automatic types use electricity to regulate door swing behavior. Door closers can be linked to a building's fire and security alarm systems. [2]

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  6. Chamberlain Group - Wikipedia

    en.wikipedia.org/wiki/Chamberlain_Group

    Chamberlain Group (CGI), the corporate parent company to LiftMaster, Chamberlain, Merlin, and Grifco, designs and engineers residential garage door openers, commercial door operators, security cameras, and gate entry systems.

  7. Swing-door operator - Wikipedia

    en.wikipedia.org/wiki/Swing-door_operator

    Some are built on top of a standard door closer. 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.

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