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Beijing Superior Drilling Equipment Co., Ltd.
Ji Ning Hengwang Mining Machinery Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Maxxon (Hangzhou) Construction Machinery Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Shenyang New Densen Casting and Forging Co., Ltd.
Yantai Petroleum Machinery Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.