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Puyang Zhongshi Group Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Ji Ning Hengwang Mining Machinery Co., Ltd.
OASIS OIL TOOLS CO., LTD.