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Beijing Superior Drilling Equipment Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Shenyang New Densen Casting and Forging Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Chance Door International Co., Ltd.
OASIS OIL TOOLS CO., LTD.