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