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Page up applies the image of paper with the raised angle,the method to use it is similar to using those general rulers.
The advantage of Page up is that the raised angel make users to take it easily while the traditional ones might wastes users's time to take them up; besides, users will find out it's just as simple as turning pages.
National Cheng Keng University
Tainan, Taiwan
National Cheng Keng University
Tainan, Taiwan
Weng-Kan / Cheang
Pin-Chin / Wang
Tsung-Han /Tsai