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Puyang Zhongshi Group Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Nanchang Bestway Cemented Carbide Co., Ltd.
OASIS OIL TOOLS CO., LTD.
Ji Ning Hengwang Mining Machinery Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.