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