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Lock puzzle

Lock puzzles usually employ older-type doorlocks with unusual or hidden mechanics. Such locks are also called trick-locks[?], because opening them is like performing a magic trick. A matching key may or may not be used in this trick.

Lock puzzles have a long history. Chinese jewelry boxes often contain trick-locks[?] and hidden drawers. Other lock puzzles stem from the necessity to invent secure locks in the middleages.

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