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Ordinary stapler can not guarantee the exact distances when you use it to staple papers together. We plus scals
on both sides of the stapler , with the scales, you can guarantee the same locations where you want to put the
staples on.
Shaanxi University of Science & Technology
xi`an, China
Shaanxi University of Science & Technology
xi`an, China
Shaobo Geng Liangbing Hu Longzhen Li
