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起保护作用的刀 / The Protective Knife

起保护作用的刀

in order to prevent accidents when people cutting,so add springs at the bottom.when the blade leaves the object.the spring contracts,and the blade recovers.

Design

Chengdu University of Technology Chengdu,Sichuan,China

Chengdu University of Technology Chengdu,Sichuan,China
Chengdu, China