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