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  2. First-price sealed-bid auction - Wikipedia

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

    This holds only when the agents' valuations are statistically independent; when the valuations are dependent, we have a common value auction, and in this case, the revenue in a second-price auction is usually higher than in a first-price auction. The item for sale may not be sold if the final bid is not high enough to satisfy the seller, that ...

  3. 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]

  4. 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.

  5. Concealment device - Wikipedia

    en.wikipedia.org/wiki/Concealment_device

    A device whereby a safe-looking safe is left open but has a hidden compartment (e.g., in the door) where small valuable articles can be hidden. As an alternative variant, a safe may be "stocked" with some lesser valuables, with the expectation that it will be burgled, but that the real safe or hiding place for the important valuables will be ...

  6. Mantrap (access control) - Wikipedia

    en.wikipedia.org/wiki/Mantrap_(access_control)

    Entrance to HM Prison Edinburgh. A mantrap, security mantrap portal, airlock, sally port or access control vestibule is a physical security access control system comprising a small space with two sets of interlocking doors, such that the first set of doors must close before the second set opens.

  7. Railway coupling - Wikipedia

    en.wikipedia.org/wiki/Railway_coupling

    The bell-and-hook coupling system was first introduced in the Cape of Good Hope in 1902, when two CGR Type A 2-6-4T locomotives were acquired as construction engines on the new 2 ft (610 mm) narrow gauge Avontuur Railway which was being constructed out of Port Elizabeth through the Langkloof. In South Africa, these couplers were used on only ...