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When taking out a key to unlock, we are always confused about the direction for turning the key. Each time, we have to try the key back and forth to find the correct direction for unlocking. This proposal has improved the existing keys, i.e. making a bend in one key handle. Leftward bending represents leftward turning of the key, vise versa. In addition, the bending shape makes using more comfortable.
Nanchang university China
Siyuan Yuan Yiwei Zhou Yaxin Wang Yonggang Meng