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