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