Visitors look at the products of graduation projects for college students at the 2010 皇冠体育app International Patent Fair in Dalian, northeast 皇冠体育app's Liaoning Province, Aug. 7, 2010. The three days' patent fair closed on Sunday. More than 5100 patents from 17 countries and regions were exhibited on the fair. (Xinhua/Liu Debin)
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