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When you are in the classroom or in the office, when you want to pull down the rollingscreen in order to keep put the sunshine,or you want to pull up the screen to let the sunshine get in ,you may not make sure that the bead chainis most suitable for the effects you want to achieve .This design replace the traditional roundball bead chain with the arrow shape which can let you easily distinguish the direction and make your life more comfortable.
Zhejiang University of Technology
Dong wang Yuanzhong zhang Yizhi zhuang Hong shen