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