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2. 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]

3. 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.

4. Enforcer (battering ram) - Wikipedia

   en.wikipedia.org/wiki/Enforcer_(battering_ram)

   The Enforcer is a 16 kg hardened steel construction with a steel pad at the impact end so that it can absorb the impact, [2] and a handle at the opposite end angled so that the user can swing accurately at inward-opening doors without actually applying their own pressure more than necessary. [2]

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. Concealment device - Wikipedia

   en.wikipedia.org/wiki/Concealment_device

   Usually the only tool required is a screwdriver, the device can be opened up, have the majority of the electronic and mechanical components removed and replaced with the goods to be concealed. Some of the more common devices used for this purpose are video players such as VHS, CD, DVD and Blu-ray players, computer accessories such as DVD-ROM ...

7. Concealed hinge jig - Wikipedia

   en.wikipedia.org/wiki/Concealed_hinge_jig

   Concealed hinge drilling jig with embedded Forstner bit. A concealed hinge drilling jig is a type of support jig, designed for drilling 3 cm holes to fit concealed hinges into modern wardrobe doors. As many of the complementary tools used in woodworking, it uses an electric hand-drill for its operation, making a Forstner bit to turn.