Top 10 billionaires in the world 2013: Hurun
- By Xu Lin
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E-mail China.org.cn, March 6, 2013
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David Koch（大衛(wèi)?科赫）
2013 Wealth: US$31 billion
Company: Koch Industries（科氏工業(yè)）
Industry: Energy
Age: 72
Country of residence: U.S.A.
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