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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. Rolling code - Wikipedia

    en.wikipedia.org/wiki/Rolling_code

    An attacker may be able to learn the code word that opened the door just now, but the receiver will not accept that code word for the foreseeable future. A rolling code system uses cryptographic methods that allow the remote control and the receiver to share codewords but make it difficult for an attacker to break the cryptography.

  5. PDF - Wikipedia

    en.wikipedia.org/wiki/PDF

    Interactive Forms is a mechanism to add forms to the PDF file format. PDF currently supports two different methods for integrating data and PDF forms. Both formats today coexist in the PDF specification: [38] [53] [54] [55] AcroForms (also known as Acrobat forms), introduced in the PDF 1.2 format specification and included in all later PDF ...

  6. Douglas DC-6 - Wikipedia

    en.wikipedia.org/wiki/Douglas_DC-6

    The rear cargo door came standard with a built in 4,000 lb (1,800 kg) lift elevator and a Jeep. The Jeep was a public relations stunt and shortly after, was dropped. [9] Slick Airways was the first airline to operate the freighter variant in April 1951. [10] DC-6B All-passenger variant of DC-6A, without cargo door.

  7. U.S. re-entry permit - Wikipedia

    en.wikipedia.org/wiki/U.S._re-entry_permit

    A permanent resident who obtained permanent residence as a refugee may either apply for a refugee travel document or a re-entry permit, but not both. Specimen Identity page of a USCIS issued travel document to a permanent resident. USCIS Form I-131 (Application for a Travel Document) is used to apply for the re-entry permit and other travel ...