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Most of the students in China use school card. As for the convience, they would like to mark the points with their school cards when they are in class or reading books. However, it will easily make the card dirty.So, our design of this school card, simply based on inclined plane of the ruler, is to make the angle of one side of the card to 6°. And the tilt of the part will prevent the ink from the card, which can solve the problem we mentioned aboved.
Wuhan University of Science and Technology