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Drawing for the sake of accuracy we need different lengths of ruler to draw, however, the long ruler make we use or carry less convenient. This design was improved for this problem, simply hold down the middle of a small slide by hand and nudge ruler will be able to draw a straight line of infinite length, easy to carry, easy to operate, and saving materials.
Nanjing University of Science and Technology(NUST)
NanJing, China
Nanjing University of Science and Technology(NUST)
NanJing, China