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Barron lock
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Figure 4: Barron tumbler lock, 1778
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Barron lock

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  • Figure 1: Ancient Egyptian lock
    In lock: Development of modern types.

    The Barron lock (see Figure 4) had two tumblers and the key had to raise each tumbler by a different amount before the bolts could be shot. This enormous advance in lock design remains the basic principle of all lever locks.

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