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Puyang Zhongshi Group Co., Ltd.
OASIS OIL TOOLS CO., LTD.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.
Nanchang Bestway Cemented Carbide Co., Ltd.
Shenyang New Densen Casting and Forging Co., Ltd.