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  2. Door closer - Wikipedia

    en.wikipedia.org/wiki/Door_closer

    Modern manual door closer Eclipse door spring and separate checking mechanism. 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.

  3. dormakaba - Wikipedia

    en.wikipedia.org/wiki/Dormakaba

    KABA key. 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.

  4. Fire door - Wikipedia

    en.wikipedia.org/wiki/Fire_door

    Fire-resistance rated door, with wire mesh glass vision panel Industrial grade fire door rated to hydrocarbon curve and blast resistance Double fire door immediately after 3-hour fire test inside a 4-hour rated Durasteel wall Double fire door after 3-hour fire test in a 4-hour Durasteel wall, during successful 45PSI (3.1 bar) hose stream test leading to a UL Listing [1]

  5. Door - Wikipedia

    en.wikipedia.org/wiki/Door

    A jib door is a concealed door, whose surface reflects the moldings and finishes of the wall. These were used in historic English houses, mainly as servants' doors. [18]: 101 A pet door (also known as a cat flap or dog door) is an opening in a door to allow pets to enter and exit without the main door's being opened.

  6. YKK - Wikipedia

    en.wikipedia.org/wiki/YKK

    Closeup of a YKK zipper on blue jeans. The YKK Group (YKKグループ, Waikeikei Gurūpu) is a Japanese group of manufacturing companies. They are the world's largest zipper manufacturer, also producing other fastening products, architectural products, plastic hardware and industrial machinery.

  7. Are these companies 'wiping out the middle class'?

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