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Figure 4: Barron tumbler lock, 1778

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tumbler

lock mechanism

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In lock: Development of modern types.
…in England, patented a double-acting tumbler lock. A tumbler is a lever, or pawl, that falls into a slot in the bolt and prevents it being moved until it is raised by the key to exactly the right height out of the slot; the key then slides the bolt. The…
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