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Zibo Qingdong Machinery Manufacturing Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Nantong Yutung Industrial Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.