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Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Nanchang Bestway Cemented Carbide Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
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Beijing Superior Drilling Equipment Co., Ltd.
Ji Ning Hengwang Mining Machinery Co., Ltd.