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