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Some time, we want our rulers to be short for portable. But, we need longer rulers when we are trying to draw a large picture. Magic Ruler is design to solve this problem. Each ruler is designed as a part of puzzles, which can be joint together to be a longer ruler easily when we need a long ruler. What is more, we can take up Magic Ruler more convenient because of the special design to the ruler。
Xiangtan University
Xiangtan,Hunan Province, China
Xiangtan University
Xiangtan,Hunan Province, China
Luo Jianping