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拱形尺 / Arched Ruler

拱形尺

In the drawing , the common ruler need a translation on the paper when you want to pick it up So, often let the drawn lines inflected with ink. Arched ruler will restore arched after drawing, that make it easy and convenient for pick up the ruler .

University

Tianjin Academy Of Fine Arts

Tianjin Academy Of Fine Arts
TIanjin, China