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Puyang Zhongshi Group Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Ji Ning Hengwang Mining Machinery Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.
Nantong Yutung Industrial Co., Ltd.