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OASIS OIL TOOLS CO., LTD.
Puyang Zhongshi Group Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.