BEIJING (AFX-ASIA) – Warren Buffett’s holding company Berkshire Hathaway Inc raised its stake in PetroChina Co Ltd (HK 0857; NYSE PTR) seven times this month, paying around HK$1.42 billion to double its holding to over 13% of the state-owned oil producer’s Hong Kong publicly-traded stock. (US$1=HK$7.78). However, with PetroChina’s parent, China National Petroleum Corp holding…

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