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We often use a knife to cut papers , but few draw straight.That is because the tip is a point,This design concept from the geometry :Two points make a straight line. When we use this knife to draw straight lines, we can open the bracket , there is a wheel below the bracket , so we use utility knife to draw a straight line is fast and convenient.
Han Dai，Chunming Zhang，Xinyuan Che，Lianhu Duan