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  2. Door - Wikipedia

    en.wikipedia.org/wiki/Door

    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. It may be simply covered by a rubber flap, or it may be an actual door hinged on the top that the pet can push through. Pet doors may be mounted in a sliding glass door as a new (permanent or temporary ...

  3. Pet door - Wikipedia

    en.wikipedia.org/wiki/Pet_door

    A dog exiting through a pet door. A pet door or pet flap (also referred to in more specific terms, such as cat flap, cat door, kitty door, dog flap, dog door, or doggy/doggie door) is a small opening to allow pets to enter and exit a building on their own without needing a human to open the door. Originally simple holes, the modern form is a ...

  4. 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]

  5. Sliding glass door - Wikipedia

    en.wikipedia.org/wiki/Sliding_glass_door

    A sliding glass door. In architecture and construction, a sliding glass door (also patio door or doorwall [1] [2]) is a type of sliding door made predominantly from glass, that is situated in an external wall to provide egress and light.

  6. Swing Door (train) - Wikipedia

    en.wikipedia.org/wiki/Swing_Door_(train)

    Swing Door trains, commonly known as "Dogboxes" or "Doggies", were wooden-bodied electric multiple unit (EMU) trains that operated on the suburban railway network of Melbourne, Victoria, Australia. Swing Door cars had outward-opening doors and were reasonably narrow, to ensure that two passing trains would not foul each other if doors were ...

  7. The Dog (Goya) - Wikipedia

    en.wikipedia.org/wiki/The_Dog_(Goya)

    The placard for The Dog painting in The Prado indicates the dog is in distress, quite literally, drowning. The Dog is one of Goya's Black Paintings, which he painted directly onto the walls of his house sometime between 1819 and 1823 when he was in his mid-70s, living alone and suffering from acute mental and physical distress. He did not ...