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In order to solve the problem of dirty public seating and easy, designed to sit back backrest area larger than the area, even though the winter season, do not have to worry about falling leaves, rain, snow and dirty chair unusable problems. Retraction in the back side of the surface, according to the man-machine size requirements, opened the back parts of a groove, easy to use people off the backrest and the backrest has a convex outer side, giving the semantic description.
Jilin City, China