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