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  2. Watchclock - Wikipedia

    en.wikipedia.org/wiki/Watchclock

    A watchclock station with key hanging on a chain. A watchclock is a mechanical clock used by security guards as part of their guard tour patrol system which require regular patrols. The most commonly used form was the mechanical clock systems that required a key for manual punching of a number to a strip of paper inside with the time pre ...

  3. Remote keyless system - Wikipedia

    en.wikipedia.org/wiki/Remote_keyless_system

    When a button is pushed, it sends a coded signal by radio waves to a receiver unit in the car, which locks or unlocks the door. Most RKEs operate at a frequency of 315 MHz for North America-made cars and at 433.92 MHz for European, Japanese and Asian cars.

  4. Trapped-key interlocking - Wikipedia

    en.wikipedia.org/wiki/Trapped-key_interlocking

    The key can then be used to unlock the kiln door. While the key is removed from the switch interlock, a plunger from the interlock mechanically prevents the power switch from being turned on. Power cannot be re-applied to the kiln until the kiln door is locked, releasing the key, and the key is then returned to the power switch interlock. [5]

  5. Tubular pin tumbler lock - Wikipedia

    en.wikipedia.org/wiki/Tubular_pin_tumbler_lock

    A tubular lock and key. A tubular pin tumbler lock, also known as a circle pin tumbler lock, radial lock, or the trademark Ace lock popularized by manufacturer Chicago Lock Company since 1933, is a variety of pin tumbler lock in which a number of pins are arranged in a circular pattern, and the corresponding key is tubular or cylindrical in shape.

  6. Combination lock - Wikipedia

    en.wikipedia.org/wiki/Combination_lock

    A Wordlock letter combination lock.. A combination lock is a type of locking device in which a sequence of symbols, usually numbers, is used to open the lock. The sequence may be entered using a single rotating dial which interacts with several discs or cams, by using a set of several rotating discs with inscribed symbols which directly interact with the locking mechanism, or through an ...

  7. The best Walmart Black Friday 2024 deals: Shop the latest ...

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    Trending Walmart Black Friday Deals. HP 15.6 inch Windows Laptop, $199 (was $379) Apple AirPods 2nd Gen, $89 (was $129). Shark Navigator Lift-Away XL Upright Vacuum, $97 (was $199). KitchenAid ...

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