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Beijing Superior Drilling Equipment Co., Ltd.
Shenyang New Densen Casting and Forging Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Ji Ning Hengwang Mining Machinery Co., Ltd.