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Puyang Zhongshi Group Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Nanchang Bestway Cemented Carbide Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
Nantong Yutung Industrial Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.