Abstract:The development of barbed-spring locks in ancient China has a history of more than two thousand years. With the development of the design and manufacturing techniques in ancient China, the safety of locks has gotten better and better. Since the 17th century, the puzzle lock, with a complicated structure and a high difficulty in opening, was gradually developed and used. The puzzle lock needs specific steps to be opened. Even if strangers have the correct key, it is still difficult for them to open the lock imm… Show more
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