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