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