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We can hardly handle both papers and drawing pins when we pin some paper on the board, and normally one side of paper is pinned up, while the other side falling over. This efficient drawing pin can solve this problem nicely with its two pins. The paper can be pinned up steady with only one drawing pin.
Dalian Polytechnic University
School of Art and Design, DPU
Fan Yang, Jihao Jiang, Hao Wang