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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. Blinking twelve problem - Wikipedia

    en.wikipedia.org/wiki/Blinking_twelve_problem

    In software design, the blinking twelve problem [1] is when features in software or computer systems are rendered unusable to most users by the complexity of the interface to them. The usage emanates from the 'clock' feature provided on many VCRs manufactured in the late 1980s or early 1990s. The clock could be set by using a combination of ...

  4. Automotive lighting - Wikipedia

    en.wikipedia.org/wiki/Automotive_lighting

    Cars in the US only have red tail lights, and no blue lights; a vehicle displaying a red (forward-facing) light (flashing or not) coming towards a driver, or from behind the driver (in rearview mirror) indicates that an official emergency vehicle is coming, requiring the driver to yield, pull off to the side of the road, or otherwise get out of ...