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The pencil sharoener is made by bending uniwafer
metal. it can not only simplify the modelling of pencil
sharpener, but also increase a method of cut.such a
way can make the pencil sharpenermore available.
zhejiang sci-tech university
Hangzhou, China
zhejiang sci-tech university
Hangzhou, China
Ling'en Wang
Mang Xia
