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