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Shaanxi Aipu Machinery Manufacture Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.