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Puyang Zhongshi Group Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Nanchang Bestway Cemented Carbide Co., Ltd.