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Beijing Superior Drilling Equipment Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
Hangzhou ZGSM Technology Co.,Ltd
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Nanchang Bestway Cemented Carbide Co., Ltd.