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Zibo Qingdong Machinery Manufacturing Co., Ltd.
Shenyang New Densen Casting and Forging Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Nanchang Bestway Cemented Carbide Co., Ltd.
OASIS OIL TOOLS CO., LTD.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Chance Door International Co., Ltd.