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Suzhou PURO Purification Technology Co., Ltd
Zhejiang Yingye Technology Co., Ltd.
Chain Guan International Company
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Nanchang Bestway Cemented Carbide Co., Ltd.