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1.Saving people in need when looking for sharpening whetstone time
2.Simple, convenient, safe
3.Will be able to repair the damaged flank play a role in their daily take the knife
Tianjin Univ of Science&Technology
JunFen Zhao（ Instructor）Lecturer RenFei Bai （ Instructor）Lecturer Industrial Design Department of Mechanical Engineering, Tianjin University of Scienc