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Puyang Zhongshi Group Co., Ltd.
Ji Ning Hengwang Mining Machinery Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Nanchang Bestway Cemented Carbide Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Nantong Yutung Industrial Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.