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