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Beijing Superior Drilling Equipment Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Nantong Yutung Industrial Co., Ltd.
Ji Ning Hengwang Mining Machinery Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.