The beneficial effect of the utility model is the accurate positioning of the center of the paper, so as to fix the location of punched holes to the needed positions.
本实用新型的有益效果是：由于能准确的定位纸的中央，从 而将冲孔的位置也固定在所需的位置。
The beneficial effect of the utility model is the accurate positioning of the center of the paper, so as to fix the location of punched holes to the needed positions.
本实用新型的有益效果是：由于能准确的定位纸的中央，从 而将冲孔的位置也固定在所需的位置。
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