Here in China, many keys have 3 dimensions. Our apartment key, for example, is shaped lake a cross, or a t. Three of the four surfaces are cut to conform to the pins in the tumbler. I can only imagine that more surfaces means more complexity and greater difficulty in picking the lock. Perhaps it also makes the lock less vulnerable to bump keys. . .
At any rate, why is this something I've only seen in China? I can't imagine we lack the technology in America?
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