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  2. Harbor Freight Tools - Wikipedia

    en.wikipedia.org/wiki/Harbor_Freight_Tools

    Harbor Freight Tools, commonly referred to as Harbor Freight, is an American privately held tool and equipment retailer, headquartered in Calabasas, California. It operates a chain of retail stores, as well as an e-commerce business. The company employs over 28,000 people in the United States, [5] and has over 1,500 locations in 48 states. [6] [7]

  3. 15 Clever Hidden Door Ideas for the Ultimate Secret Hideaway

    www.aol.com/15-clever-hidden-door-ideas...

    These 15 clever hidden door ideas lead to secret rooms or storage spaces, adding a little mystery to your home. Check out these designer spaces for inspiration.

  4. Door closer - Wikipedia

    en.wikipedia.org/wiki/Door_closer

    Modern manual door closer Eclipse door spring and separate checking mechanism. 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.

  5. Sliding bookcase - Wikipedia

    en.wikipedia.org/wiki/Sliding_bookcase

    Pixar's location in Emeryville, California, had a hidden room hidden by a sliding bookcase. [20] It was initially discovered by Pixar animator Andrew Gordon, who opened a hatch door in his office that revealed a hidden room that was designed to provide maintenance workers "access to a portion of the building's ventilation system". [ 20 ]

  6. Barn door tracker - Wikipedia

    en.wikipedia.org/wiki/Barn_door_tracker

    A simple single-arm barn door tracker can be made by attaching two pieces of wood together with a hinge. A camera is mounted on the top board, usually with some sort of ball joint to allow the camera to be pointed in any direction. The hinge is aligned with a celestial pole and the boards are then driven apart (or together) at a constant rate ...

  7. Video door-phone - Wikipedia

    en.wikipedia.org/wiki/Video_door-phone

    A video door-phone (also known as a video door entry or video intercom) is a stand-alone intercom system used to manage calls made at the entrance to a building (residential complex, detached family home, workplace, etc.) with access controlled by audiovisual communication between the inside and outside. The main feature of video door entry is ...

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