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