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This U stapler was developed by the classic design,and bring some innovations to make it possible to sew the middle of the pages.
The length of the stapler in the classic design is limited which make it unable to sew the middle area of the books.Our new design hollow out some parts of its pedestal so that it is convinent to fold pages in,so that it is convinent to sew the middle area of the book.
Our new design eliminate the defect of the classical,and cost less in material,is convinent to carry on and visually artistic.