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When there are too many books put in a pile on the bookshelf , its always hard to fetch them. In order to make it more convenient, we add a groove at the corner of the books flank. If a stack of books are put together, we can take one out easily by holding the groove. You lose a little and gain more convenience.
Huazhong University of Science & Technology
wuhan, China
Huazhong University of Science & Te
Wuhan, China
Jiaqi Liu
Yunlin Zou
Zhenfeng Mao
Zhengqi Han