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