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Beijing Superior Drilling Equipment Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Nanchang Bestway Cemented Carbide Co., Ltd.
Ji Ning Hengwang Mining Machinery Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Unibrom Corp.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.