US industrialist David Koch, who ran Koch Industries with his brother Charles Koch, died on Friday aged 79. Koch, whose wealth Bloomberg estimates at $59 billion, was a philanthropist and a major financier of conservative causes and political candidates. He derived most of his wealth from a 42% stake in Koch Industries, which has annual revenue of about $110 billion. #sutathu,#usbillionaireindustrialist,#davidkoch,#business
