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