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