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