Security guards stand at the entrance during the auction preview of China Guardian Auctions Co., in Hong Kong Sunday, Oct. 7, 2012. Chinese and international auction houses are encroaching on each other's territory in Hong Kong and Beijing for the first time this autumn sale season as they step up the battle for the Asian art market. (AP Photo/Vincent Yu)

Associated Press
Security guards stand at the entrance during the auction preview of China Guardian Auctions Co., in Hong Kong Sunday, Oct. 7, 2012. Chinese and international auction houses are encroaching on each other's territory in Hong Kong and Beijing for the first time this autumn sale season as they step up the battle for the Asian art market. (AP Photo/Vincent Yu)
Security guards stand at the entrance during the auction preview of China Guardian Auctions Co., in Hong Kong Sunday, Oct. 7, 2012. Chinese and international auction houses are encroaching on each other's territory in Hong Kong and Beijing for the first time this autumn sale season as they step up the battle for the Asian art market. (AP Photo/Vincent Yu)
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