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Puyang Zhongshi Group Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.
Shenyang New Densen Casting and Forging Co., Ltd.
Nantong Yutung Industrial Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.