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PetroChina Daqing Petroleum Equipment Manufacturing Co.,Ltd.

PetroChina Bohai Petroleum Equipment Manufacturing Co.,Ltd.

PetroChina Tarim Oilfield Company

PetroChina Qinghai Oilfield Company

Karamay Jincheng Petroleum Machinery Factory

Changqing Sucker Rod Manufacture Co.,Ltd.

Jianghan Oilfied Kingdream Public Limited Company

Sinopec Zhongyuan Oil and Gas Company

Shengli Oilfield Kerui Holding Group Co.,Ltd.

Sinopec Southwest Oil and Gas Company

Luhai Petroleum Equipment Manufacturing Co.,Ltd.

Guizhou Gaofeng Petroleum Machinery Co.,Ltd.

Dezhou United Petroleum Machinery Co.,Ltd.