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  2. Rolling code - Wikipedia

    en.wikipedia.org/wiki/Rolling_code

    A rolling code (or sometimes called a hopping code) is used in keyless entry systems to prevent a simple form of replay attack, where an eavesdropper records the transmission and replays it at a later time to cause the receiver to 'unlock'. Such systems are typical in garage door openers and keyless car entry systems.

  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. Cable fault location - Wikipedia

    en.wikipedia.org/wiki/Cable_fault_location

    The conventionally used aid in cable fault testing and location is the cable test van. The van is installed with conventional cable measuring systems for quickly reaching the location of any cable fault. In 20 years that followed, over 2000 fault location vehicles were manufactured, more than half of which were intended for the former USSR.

  5. Power symbol - Wikipedia

    en.wikipedia.org/wiki/Power_symbol

    Power On (IEC 60417-5007) and Power Off (IEC 60417-5008) symbols are used to indicate positions of the rocker switch Power button marked with Standby symbol (IEC 60417-5009) turns the device on or off without fully disconnecting power supply. A power symbol is a symbol indicating that a control activates or deactivates a particular device.

  6. Kill switch - Wikipedia

    en.wikipedia.org/wiki/Kill_switch

    An emergency switch in Japan. On railways, [1] an emergency stop is a full application of the brakes in order to bring a train to a stop as quickly as possible. [2] This occurs either by a manual emergency stop activation, such as a button being pushed on the train to start the emergency stop, or on some trains automatically, when the train has passed a red signal or the driver has failed to ...

  7. Garage door - Wikipedia

    en.wikipedia.org/wiki/Garage_door

    Sectional garage door Up-and-over garage door Garage Door Hardware. A garage door is a large door to allow egress for a garage that opens either manually or by an electric motor (a garage door opener). Garage doors are frequently large enough to accommodate automobiles and other vehicles. The operating mechanism is usually spring-loaded or ...

  8. Door loop - Wikipedia

    en.wikipedia.org/wiki/Door_loop

    Door loops are used in cases where electrical components are mounted in the door leaf, like for example a motorized door lock, smart lock, smart doorbell or solenoid bolt. Since the hinges move during operation, a normal laying of cable would quickly wear out. The door loop also ensures that the twisting of the cables is distributed over a ...

  9. Ladder paradox - Wikipedia

    en.wikipedia.org/wiki/Ladder_paradox

    We now look at these events in the frame of the ladder. The first event is the front of the ladder approaching the exit door of the garage. 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.

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