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This design is for papers which can bind themselves by an opening, designed for single material and resource-saving. The printing paper or letter paper just needs a row of small holes to complete its folding and binding by itself. This is a simple method of binding papers which can be economically realized without staplers or glues. A small change can make contributions to resource-saving.
Tao Ye, Huang Yang, Wang Guanyun, Wang Nianou