The Roman innovation wasn't just about stronger metal. They popularized warded locks, which used internal obstructions inside the keyhole to block all but the correct key—a design that remained dominant for over a thousand years. The Industrial Revolution transformed lock-making from a craft into an industry. Robert Barron's 1778 double-acting tumbler lock was a massive leap, requiring levers to be lifted to precise heights. Joseph Bramah then created his famous 'Challenge Lock' in 1784, which r

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