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With novel designed hinges and soft tips, this set square could transform to a multipurpose straightedge containing 4 frequently-used angles.
Zhijiang College
Zhejiang University of Technology
Hangzhou, China
Zhijiang College of Zhejiang University of Technology
Hangzhou, China
Zhengxiao Jin,Zizheng Wang,Peng Tian ,Shuai Zhang
