11  December  2017

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SHAANXI XINLONG PETROLEUM EQUIPMENT CO., LTD (04/15/2010)
Qingdao HaiTongDa Professional Instrument Plant (03/20/2009)
Jiangsu Jinshi Machinery Group Co. Ltd (12/22/2006)
Zhongcheng Machinery Manufacturing Co., Ltd. of Dagang Oilfield Group (12/22/2006)
Beijing Hailan Science & Technology Co., Ltd (12/22/2006)
Lanzhou Ls-National Oilwell Petroleum Engineering Co., Ltd (12/21/2006)
Xingjiang Qingsong Cement Co.,Ltd. (12/21/2006)
Gezhouba Holding Company Cement Plant (12/21/2006)
Kingdream Public Limited Company (12/21/2006)
Xinjiang Mudlogging Company of Xinjiang Petroleum Administrative Bureau (12/21/2006)
Well Testing Company of Xinjiang Petroleum Administrative Bureau (12/21/2006)
Tuha Petroleum Drilling & Production Technology Research Institute (12/21/2006)
Downhole Service Company of Xinjiang Petroleum Administrative Bureau of CNPC (12/21/2006)
Daqing Petroleum Equipment Group (12/21/2006)
Drilling Company of Tuha Petroleum Exploration and Development Corporation (12/21/2006)
Sichuan Chuanshi Chrida Diamond Bit Co., Ltd (12/20/2006)
Jinan Diesel Engine Co.,Ltd (12/20/2006)
Drilling Technology Research Institute of Xinjiang Petroleum Administrative Bureau (12/20/2006)
China Petroleum Logging Co.Ltd. (12/20/2006)
CNPC Research Institute of Engineering Technology (RIET) (12/20/2006)

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