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For blindmen,it is too difficult to find the keyhold when they try to open a door.This code lock is specially designed for the blindmen,you will find three wheels under thehandle,we put the braille on the wheels as code,so that the
blind can open the door with feel.
Zhe Jiang University
Ning Bo, China
Lin Lin;Zhenpeng Li;Xuan Chen;Peng Liu