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Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.
Ji Ning Hengwang Mining Machinery Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
Puyang Zhongshi Group Co., Ltd.