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Puyang Zhongshi Group Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
OASIS OIL TOOLS CO., LTD.
Nantong Yutung Industrial Co., Ltd.