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  2. Ladder paradox - Wikipedia

    en.wikipedia.org/wiki/Ladder_paradox

    The door closes, and then opens again to let the front of the ladder pass through. At a later time, the back of the ladder passes through the entrance door, which closes and then opens. We see that, as simultaneity is relative, the two doors did not need to be shut at the same time, and the ladder did not need to fit inside the garage.

  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. Garage door - Wikipedia

    en.wikipedia.org/wiki/Garage_door

    Sectional doors do not require any space outside the garage to open. A vehicle may park very close to the garage before opening the door. Each panel of a sectional door has its connection to the door track. This increases reliability and robustness compared to monolithic doors, which have only a few track connections for the whole panel.

  5. 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.

  6. Remote keyless system - Wikipedia

    en.wikipedia.org/wiki/Remote_keyless_system

    Premium models, such as SUVs and estates with tailgates, may have a motorized assist that can both open and close the tailgate for easy access and remote operation. For offices, or residences, the system can also be coupled with the security system, garage door opener or remotely activated lighting devices.

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