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For three buttons are designed to the umbrellas billot. The middle button plays when the umbrella is used alone as well as sizeable; the second button acts at the need of helping others, just push the button to the first and the umbrella is extended to serve two. Moreover, even in the narrow streets or crowd, what you need to do is push the button back to the third to reduce umbrella occupying space.
The subtle design of threebutton can be used in a lot of different kinds of umbrellas with the purpose of solving problems brought in raining days.
Chen Hongyu、 Li Wentao、 Deng Suiqi、 Tang Xiangyan