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Hangzhou Haidelong Import and Export Co., Ltd
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
Ji Ning Hengwang Mining Machinery Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.