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Zibo Qingdong Machinery Manufacturing Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.
Nanchang Bestway Cemented Carbide Co., Ltd.
Chance Door International Co., Ltd.