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We've been using a stack to only clip one piece of paper.When the file types are more than one, it must be used another. + 1 clip coupled with a curved groove based on the appearance of the original clip.
Thus, + 1 clip can clip two fold of the different types of paper, which both can efficient classification management files and can save the number of use in the clip.
Xiaowei Wu，Caixiang Ding，Rufeng Dai，Ziyun Yan，Dunqi Lu，Wenjie Zhang，Dawei Pan，Huanghao Jin，Qionglei Zhu