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O-pen / pen

O-pen

The pen has changed the traditional neutral pen of Open.
It opens the way to rotate so that the cartridge is more conv-
enient exchange. This pen refills with snap fixed form, and
sharpened tip section.When you need to draw a circle, it can
be used as a compass.

University

College of Science &Technology Ningbo University

College of Science &Technology Ningbo University
Ningbo, China

Guanming Chen,
College of Science &Technology Ningbo University

Songtao Jin,
College of Science &Technology Ningbo University

Zhuang Chen,
College of Science &Technology Ningbo University

Jiaheng Chen,
College of Science &Technology Ningbo University