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Complementary / pencil

Complementary

With this complementary pencil, we no longer have to worry about because of poor use pencil nib is no longer to be thrown away, as short as a pencil can not be used when the connector is connected with another pen, so written can then be used, pencil refills can be all use, it has not been wasted material.

University

Nan Chang University

Nan Chang University
Nanchang City,Jiangxi Province, China

Yangbin Cui,
Nan Chang University

Zhihong Yang,
Nanchang university

Jiayiwei Wan,
Nanchang university

Xiaodong Li,
Nanchang university