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  2. Chamberlain Group - Wikipedia

    en.wikipedia.org/wiki/Chamberlain_Group

    Craftsman — re-branded Chamberlain models sold at Sears. Those products have a "139" model prefix to denote that the Chamberlain Group made them for Sears. Clicker — a line of universal garage door remotes. Chamberlain, LiftMaster, and Craftsman have interchangeable parts, primarily the gear and circuit boards.

  3. Garage door opener - Wikipedia

    en.wikipedia.org/wiki/Garage_door_opener

    The electric overhead garage door opener was invented by C.G. Johnson in 1926 in Hartford City, Indiana. [1] Electric Garage Door openers did not become popular until Era Meter Company of Chicago offered one after World War II where the overhead garage door could be opened via a key pad located on a post at the end of the driveway or a switch inside the garage.

  4. Chamberlain Group, Inc. v. Skylink Technologies, Inc. - Wikipedia

    en.wikipedia.org/wiki/Chamberlain_Group,_Inc._v...

    The Model 39 bypasses the Chamberlain's rolling code system by imitating Security+'s resynchronization feature. The Model 39 transmitter sends three fixed codes in rapid succession; this either causes the door to open due to the first code or it causes the door to resynchronize and open due to the latter two codes. [1]

  5. The Genie Company - Wikipedia

    en.wikipedia.org/wiki/The_Genie_Company

    Overhead Door Corporation purchased the company in 1994. [2] The Genie Company is headquartered in Mt. Hope, Ohio. [3] The company distributes its openers & accessories through professional dealers and retailers throughout the United States and Canada. [4] The company President is Michael Noyes. Genie's factory is located in nearby Baltic, Ohio.

  6. Crash bar - Wikipedia

    en.wikipedia.org/wiki/Crash_bar

    A crash bar (also known as a panic exit device, panic bar, or bump bar) [1] [2] is a type of door opening mechanism which allows users to open a door by pushing a bar. While originally conceived as a way to prevent crowd crushing in an emergency, crash bars are now used as the primary door opening mechanism in many commercial buildings.

  7. Door closer - Wikipedia

    en.wikipedia.org/wiki/Door_closer

    Another type of surface mounted door closer is attached to the door frame behind the door (where the hinges are) next to the middle hinge. The "arm" (tail) rests against the door, and a spring that is twisted by the user opening the door closes the door by returning to its pre-twisted shape.

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