Sign up for an Award
Participate with your entry in one of our professional or student awards.
Sign up for an awardLearn more:
Unsupported browser
You are using an outdated browser. Please upgrade your browser to improve your experience.
A subtly angle design of V-Ruler offers an efficient writing experience. When your finger press it gently, it could form an angle, which not only make no scratches on your paper, but also make you pick up the ruler easily.
China Zhengzhou Institute of
Aeronautical Industry Management
Zhengzhou, China
China Zhengzhou Institute of
Aeronautical Industry Management
Zhengzhou, China
Hanpu Liu
Guoqing Li
Taiming Suo
Chenyang Chen