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Simple pen / Simple pen

Simple pen
Simple pen

Simple pen, when the pen runs out of ink after the ink on the pen in general have a complicated process, and there was a time when the ink on a business trip forget, consider this simple pen two factors, the ink on the simplified process , just to bring a pen ink can be directly Shanghao, equivalent to the principle of the syringe. 2. Pen ink tube is transparent, how much ink left can easily see.

University

hunan university of science and technology

hunan university of science and technology
xiangtan, China

Design

hunan university of science and technology

hunan university of science and technology
xiangtan, China