Sep. 7, 2009 (China Knowledge) - PetroChina Co Ltd<601857><0857><PTR>, a subsidiary of China National Petroleum Corp, on Sep. 4 indirectly became the sole owner of Singapore Petroleum Company Ltd, according to a statement released by PetroChina's board of directors.
On Sep. 4, PetroChina purchased a 50.7% stake in Singapore Petroleum through a subsidiary, PetroChina Internation
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