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When we use stapler ,it is difficult to bind staples exactly.It seems impossible that we can bind staples in a line and make the same distance between two staples.And irregular staples affect tidiness of documents. Straight Line is a design for soving this problem.When people use" Straight Line" to bind documents by pressing it ,it will project locating ray to make people control the location of staples.Thus,documents can become more orderly.
Dalian Nationalities University