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Puyang Zhongshi Group Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Nanchang Bestway Cemented Carbide Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
OASIS OIL TOOLS CO., LTD.