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