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Ji Ning Hengwang Mining Machinery Co., Ltd.
Shenyang New Densen Casting and Forging Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
OASIS OIL TOOLS CO., LTD.
Puyang Zhongshi Group Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.