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There covered with a layer of magnetic material inside the lock
hole . It can make the key insert into the lock hole easily and
accurately through the guidance of magnetic.
The way will bring great convenience to the blind and the people
who feel difficult to aim at the lock hole in the dark.
Zhejiang Sci-Tech University
Hangzhou, China
Zhejiang Sci-Tech University
Hangzhou, China
Zhejiang Sci-Tech University
Hangzhou, China
Feixiang Huo
Huichao Xia