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Exposition of "ad:tech San Francisco 2013" kicks off

04-10-2013 17:25 BJT

US-SAN FRANCISCO-ADVERTISEMENT-EXPOSITION

Tim Armstong (R), CEO of AOL, delivers a keynote speech during the opening ceremony of the "ad:tech San Francisco 2013" in San Francisco, the United States, April 9, 2013. The two-day exposition has over 30 lectures and about 200 booths for international advertisement companies and clients. (Xinhua/Liu Yilin)

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