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