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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. 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.

4. Hidden compartment - Wikipedia

   en.wikipedia.org/wiki/Hidden_compartment

   A hidden compartment at the back of a lap desk, with two small drawers concealed beneath the pen and inkwell compartments A hidden door between the library and changing rooms at Mottisfont Abbey in England.

5. Geared continuous hinge - Wikipedia

   en.wikipedia.org/wiki/Geared_continuous_hinge

   A geared continuous hinge is a type of continuous hinge used mostly on doors in high-traffic entrances and features gear teeth that mesh together under a cap that runs the length of the hinge. The hinges use a number of fasteners to attach the door to the frame from top to bottom to distribute a door’s weight more evenly along the frame to ...

6. Three-point locking - Wikipedia

   en.wikipedia.org/wiki/Three-point_locking

   Three point lock are also commonly used in wardrobes, like from Hettich [6] [7] Single-point locking may provide adequate security for some situations on tiered lockers, as the doors are shorter, and therefore more difficult to force open; however, the taller doors of full length lockers and cabinets are more susceptible to the application of leverage.

7. First-price sealed-bid auction - Wikipedia

   en.wikipedia.org/wiki/First-price_sealed-bid_auction

   The item for sale may not be sold if the final bid is not high enough to satisfy the seller, that is, the seller reserves the right to accept or reject the highest bid. If the seller announces to the bidders the reserve price, it is a public reserve price auction. [ 8 ]