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In real life, it is not easy to pick up a ruler on a horizontal surface. When you draw a line on paper, ruler close to the paper and the ink on ruler easily soiled paper. Easy To Take Ruler is an improved design. It changes the four edges of the ruler to chamfers. And it makes some space between the tick mark of the ruler and the horizontal scale. The design solves the problems of pick up and dirty the paper.
Guangdong Ocean University