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