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Postal waybill contains personal informations.To prevent privacy from leaking we need to tear it off before discarding.But it's a tricky and time-comsuming work to tear them off.This design solves the problem,jagged edge can not only be served as a reminder,but also is very convenient to tear the waybill off thoroughly.
Zhejiang University of Technology
Zhejiang Sci-Tech University
Hanlin Wang,Wei Ma,Shanfei Chen Junjie Xiao