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  2. Positive locking device - Wikipedia

    en.wikipedia.org/wiki/Positive_locking_device

    A wheel hub with a castellated nut secured in the center using a cotter pin to prevent it from unscrewing. A positive locking device is a device used in conjunction with a fastener in order to positively lock the fastener.

  3. Latch - Wikipedia

    en.wikipedia.org/wiki/Latch

    Once the door is fully closed, the bolt automatically extends into the strike plate, holding the door closed. The latch bolt is disengaged (retracted) typically when the user turns the door handle , which via the lockset's mechanism, manually retracts the latch bolt, allowing the door to open.

  4. Electromagnetic door holder - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_door_holder

    Wall-mounted electromagnetic door holder securing a door in the open position. An electromagnetic door holder (electromagnetic door holder and release or hold-open device, sometimes informally called a mag hold open or electric doorstop) is a simple electromechanical mechanism which can be used to hold a fire door or security door open until given a signal to release.

  5. Door handle bacteria - Wikipedia

    en.wikipedia.org/wiki/Door_handle_bacteria

    A door may be held open with a device such as a door holder [1] or door closer, [2] which can automatically release the door upon the sound of a fire alarm and protect a building in the event of a fire. An ultraviolet door handle attendant can be installed to sterilize the existing handle. Automatic door handle sanitisers are used mainly in ...

  6. Zipper Catches Skin - Wikipedia

    en.wikipedia.org/wiki/Zipper_Catches_Skin

    Zipper Catches Skin is the second of three studio albums which Cooper refers to as his "blackout" albums, the others being the preceding album, Special Forces (1981), and the following album, DaDa (1983), as he has no recollection of recording them, due to the substance abuse, although he did manage to film a television advertisement intended ...