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  2. 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.

  3. 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 ...

  4. Garage door - Wikipedia

    en.wikipedia.org/wiki/Garage_door

    The weight of the door may be 400 lb (180 kg) or more but is balanced by either a torsion spring system or a pair of extension springs. [2] A garage door opener is controlled motorized mechanism for opening garage doors adds convenience, safety, and security often used with a remote or a button on wall. [3]

  5. Mine railway - Wikipedia

    en.wikipedia.org/wiki/Mine_railway

    A Siemens and Haske pure storage battery locomotive was in use in a coal mine in Gelsenkirchen (Germany) by 1904. [70] One problem with battery locomotives was battery replacement. This was simplified by use of removable battery boxes. Eventually, battery boxes were developed that included wheels so that they could be rolled off of the ...

  6. Rolling code - Wikipedia

    en.wikipedia.org/wiki/Rolling_code

    Remote controls send a digital code word to the receiver. If the receiver determines the codeword is acceptable, then the receiver will actuate the relay, unlock the door, or open the barrier. Simple remote control systems use a fixed code word; the code word that opens the gate today will also open the gate tomorrow.

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!