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Tanchain New Material Technology Co., Ltd
Chengdu Hengxinchang Co., Ltd
Beijing Superior Drilling Equipment Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Nanchang Bestway Cemented Carbide Co., Ltd.