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Rotation Thumbtack / Rotation Thumbtack

Rotation Thumbtack
Rotation Thumbtack

In our daily life,we often meet some problems when we use the tacks .For example,it may hurt your fingers and not easy to pick them up or to place them.And rolling si also problem.This kind of turning tacks can solve the problems. When we use them,we can just turn the knob,the head will come out.If we do not use them,turn the knob back,the head will be on .These tacks are oual column ,so it is easy to press.


Fuzhou University

Fuzhou University
Fujian Xiamen, China

Diancheng Wang,
Fuzhou University