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Drawing pins are common tools used to fix some paper files , blueprints to some places. If there are too many files for people to deal with, it is difficult to remember the order or the date of the files. To print numbers on the pins can settle the problem easily. The ten numbers on the pins from 0 to 9 can make you remember the order of the files.
Tianjin University of Technology
Tianjin, China
Hidea Design
Tianjin, China