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One of the demerits of tacks is that the pins likely to point upwards, which might hurt users finger when they try to pick up a tack. This pushpin box is designed to solve this problem. There is a magnet hiding in the bottom of the box. By that way, metal pins of tacks will be attracted to the box bottom, which means there will be no upwards pins and no hurts any more.
Jian Chen，Mingming Wang, Kunpeng Wang，Xiumin Lin，Hanchao Li，Yang Li，Lingyan Xie，Jingwen Yu，Yuan Gao，Peinv Xu，Yiyun Xu ，Pan Wang