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  2. Chamberlain Group - Wikipedia

    en.wikipedia.org/wiki/Chamberlain_Group

    Clicker — a line of universal garage door remotes. Chamberlain, LiftMaster, and Craftsman have interchangeable parts, primarily the gear and circuit boards. The greatest difference between the brands is that Chamberlain and Craftsman operate on a square shaped split-rail system, while LiftMaster consists of one single solid piece of inverted ...

  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. Door chain - Wikipedia

    en.wikipedia.org/wiki/Door_chain

    A door chain, security chain, or security door chain or chain door interviewer [1] consists of a small chain attached to the door frame, which attaches to a track on the door for security purposes. It is a type of lock that is often used along with other types of locks to secure a door. [ 2 ]

  5. Chain - Wikipedia

    en.wikipedia.org/wiki/Chain

    Door chain, a type of security chain on a door that makes it possible to open a door from the inside while still making it difficult for someone outside to force their way inside Gang transport chain, a chain used to shackle two or more inmates together for transport or work outside the facility, forming a chain gang

  6. Speaker Johnson says House will match Trump’s pace as ... - AOL

    www.aol.com/news/speaker-johnson-says-house...

    House Speaker Mike Johnson is pushing forward with President Donald Trump's requested budget deal, mocking "flailing" Democrats.

  7. Four-bar linkage - Wikipedia

    en.wikipedia.org/wiki/Four-bar_linkage

    In the study of mechanisms, a four-bar linkage, also called a four-bar, is the simplest closed-chain movable linkage. It consists of four bodies, called bars or links, connected in a loop by four joints. Generally, the joints are configured so the links move in parallel planes, and the assembly is called a planar four-bar linkage. Spherical and ...

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