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One of the most important function of the existing long ruler is cutting paper. But it is very dangerous, blade surface sliding out often cut hand. V creativity in the design of the structure, it’s a good protection for hand, and attached the part of the function of the triangle. Facilitate the protection of human life health and safety.
Wuhan University of Technology
Wuhan, China
Wuhan University of Technology
Wuhan, China
Yongjun Chen Yimu Yang Wenxin Xu
