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Stampede-proof staircase wins national patent

Updated: 2012-11-30 16:08
( chinadaily.com.cn)
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 Stampede-proof staircase wins national patent

Liu Hao, a junior high student in Changsha city, Central China's Hunan province, shows his national patent-winning invention, a stampede-proof staircase, on Nov 29, 2012. [Photo/asianewsphoto] 

 

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