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Jianhu Jielin Petrochemical Machinery Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Nantong Yutung Industrial Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.