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