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Ruler of 5° / Ruler

Ruler of 5°
Ruler of 5°

The ruler of 5° is a special for the people who use the ruler to draw the line. When we use a ruler to draw a line,often because the ruler stained with paint and dirty paper. For the part of the problem of the contact between the ruler and the paper.Carried out a 5° of treatment, so that it will avoid dirty paper

University

Zhongyuan University of Technology

Zhongyuan University of Technology
Zhengzhou, China