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mark pen improved design / Marker pen

mark pen improved design
mark pen improved design

A traditional marker pen is an individual which is numerous and complex put all of common colors' marker pens together. When you use it what is inconvenient and not easy to take. But combination of marker pens slove this problem ingenious, to add a bump struture of which get the same color marker pen together, people would clearly to find and easy to bring with it.

University

Nanchang University

Nanchang University
Nanchang, China

Shuo LI ,
Nanchang University

Shankai Tu ,
Nanchang University

Jiajun ZHOU ,
Nanchang University

Yanbing CUI,
Nanchang University