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