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  2. Rolling code - Wikipedia

    en.wikipedia.org/wiki/Rolling_code

    Simple remote control systems use a fixed code word; the code word that opens the gate today will also open the gate tomorrow. An attacker with an appropriate receiver could discover the code word and use it to gain access sometime later. More sophisticated remote control systems use a rolling code (or hopping code) that changes for every use.

  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 - Wikipedia

    en.wikipedia.org/wiki/Chamberlain_Group

    LiftMaster — the company's line of garage door openers for professional installers. Raynor — the company's line of garage door openers for professional installers. This line of professional installers is slightly less common than LiftMaster. Craftsman — re-branded Chamberlain models sold at Sears. Those products have a "139" model prefix ...

  5. Instruction list - Wikipedia

    en.wikipedia.org/wiki/Instruction_list

    Many vendors whilst incorporating the full IEC 61131-3 requirements have additional vendor specific calls/function blocks to suit their hardware such as reading or writing to I/O. Siemens PLC instruction list language is known as "Statement List" or "STL" in English, and "Anweisungs-Liste" or "AWL" in German, Italian and Spanish.

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  7. Master craftsman - Wikipedia

    en.wikipedia.org/wiki/Master_craftsman

    Master craftsman certificate – Handwerkskammer Dresden – July 7, 1958 A master discusses a vacuum compressor with his apprentice boy and several other craftsmen.. In Germany, the master craftsman (Meister) is the highest professional qualification in crafts and is a state-approved grade.