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