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  2. Pin tumbler lock - Wikipedia

    en.wikipedia.org/wiki/Pin_tumbler_lock

    Each tenant is given a key that only unlocks their own door, called the change key, but the second key is the master key, which unlocks all the doors, and is usually kept by the building manager, so they can enter any room in the building. In a master-keyed lock, some or all of the pin chambers in the lock have three pins in them instead of two.

  3. 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.

  4. Skeleton key - Wikipedia

    en.wikipedia.org/wiki/Skeleton_key

    Each door will have different wards and can only be opened by the correctly warded key or the master key. A skeleton key has the warded section of the key removed so that it opens all the doors of a system. Some applications, such as a building with multiple entrance doors, have numerous locks that are keyed alike; one key will open every door.

  5. Lever tumbler lock - Wikipedia

    en.wikipedia.org/wiki/Lever_tumbler_lock

    A three-lever lock is a common type of lever lock, but is generally used for low security applications such as internal doors [9] as their tolerances are much lower (there are fewer combinations of key available, so they are likely to unlock doors they shouldn't).

  6. Best Lock Corporation - Wikipedia

    en.wikipedia.org/wiki/Best_Lock_Corporation

    Best Lock Corporation was an American publicly traded door hardware and lock manufacturer. Founded in 1925 as Best Universal Lock Company by Frank Ellison Best, the privately held company relocated from Seattle, Washington, to Indianapolis, Indiana, in 1938, where operations expanded and evolved.

  7. Chubb detector lock - Wikipedia

    en.wikipedia.org/wiki/Chubb_detector_lock

    A later innovation was the "curtain", a disc that allowed the key to pass but narrowed the field of view, hiding the levers from anybody attempting to pick the lock. In due course Chubb began to manufacture brass padlocks incorporating the "detector" mechanism.

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  9. Deadbolt - Wikipedia

    en.wikipedia.org/wiki/Deadbolt

    Door with two locks, one in the doorknob and a separate deadbolt. A deadbolt or deadlock is a type of lock morticed into a wooden door where a bolt is thrown into the door frame, using a key from either side, to secure the door. [1] It is distinct from a spring bolt lock because a deadbolt can only

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