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The design focuses on the inconvenience of drawing parallel lines.In the premise of maintaining the simple shape of the original ruler ,adding a L-type structure,this can easily draw a straight line parallel with the paper edge and a lot of neat parallel lines.Besides,you can pick up the ruler with the L structure easily.With the minimize cost,it provids us a lot of convenience.
Guangdong University of Technology
Guangzhou, China
Guangdong University of Technology
Guangzhou, China
Yintong Zheng
Zifan Wu
Shukai Lim
Weibin Liang