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