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Tubular lock: the key pins (purple) and driver pins (blue) are pushed in the direction of the entrance of the lock, preventing the plug (yellow) from rotating. An additional pin known as the grasp pin is current between the key and driver pins in locks that settle for grasp keys, to permit the plug to rotate at multiple pin elevations. The warded lock was also present from antiquity and stays essentially the most recognizable lock and key design within the Western world.

In 1861, Linus Yale Jr. was impressed by the unique 1840s pin-tumbler lock designed by his father, thus inventing and patenting a smaller flat key with serrated edges as well as pins of varying lengths within the lock itself, the same design of the pin-tumbler lock which nonetheless remains in use at present. The pin tumbler lock uses a set of pins to prevent the lock from opening until the correct key is inserted. When the key was inserted, pins within the fixture have been lifted out of drilled holes inside the bolt, allowing it to maneuver.

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