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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. 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. General Motors GMT platform - Wikipedia

   en.wikipedia.org/wiki/General_Motors_GMT_platform

   For 1990, the Chevrolet Kodiak/GMC TopKick medium-duty trucks adopted the GMT530 designation (sharing the cab of the GMT400 trucks). For 2003, the line was redesigned, becoming the GMT560 platform (sharing a version of the GMT610 cab). After the 2009 model year, General Motors ended medium-duty truck production.

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6. Electromagnetic door holder - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_door_holder

   A simple electromagnetic door holder consists of a strong electromagnet, usually attached to a wall or mounted in a floor pedestal enclosure, next to the door it controls. The mechanism may be mounted near the floor, at the upper corner of the open door, or at any convenient height along the latch edge (away from the hinged edge).

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