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M-ruler is a multi-purpose ruler,it can be used for protractor,ruler and set square.You could
use it to draw beeline,angle,reseau,etc.You will find that it\'s very easy to used.And there
are more use waiting for your discovery.
Hunan University School of Design
Changsha, China
Ziwei Gao
Hunan University School of Design
Changsha, China
