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Puyang Zhongshi Group Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Shenyang New Densen Casting and Forging Co., Ltd.