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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.
hunan university of science and technology
xiangtan, China
hunan university of science and technology
xiangtan, China