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While opening a door in the dark night,we always have to try twice to succeed since we cannot tell the right direction of the key, and this cause users unnecessary problems.Triangular key solved this problem,the tail of the key was designed into triangle which indicates clearly of the direction of inserting,users can touch the tail of the key to tell instantly which is the right dirction.
Zhejiang Sci-Tech University
Hangzhou, China
Zhejiang Sci-Tech University
Hangzhou, China
Hanlin Wang,Wei Ma,Shanfei Chen
Junjie Xiao