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Puyang Zhongshi Group Co., Ltd.
Nanchang Bestway Cemented Carbide Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.
Yantai Petroleum Machinery Co., Ltd.
Maxxon (Hangzhou) Construction Machinery Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.