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Blind-----------This is a special group。
Know the time changes through the sense of touch, hearing, memory in their lives.Designed to solve the blind man learned through a convenient, simple way.Only one finger to touch the ring surface, Blind to know the time changes by projecting Braille。
Xian university of science and technology
Xi'an,Shaanxi, China
Xian university of science and technology
Xi'an,Shaanxi, China
Yi Nv / Hao Ding / Jing Xu / Wenzheng Zhao