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Qingdao Sangao Metal Structure Co.,Ltd is a corporate enterprise with independent legal entity, founded in 2000, the registered capital fifty-nine million and one hundred twenty thousand Yuan, with qualified production license in TV and Radio tower, 500KV power transmission steel towerand steel tube pole, a wide range of microwave communication tower and steel structure Ⅱ level installation, passing the ISO9001 quality management system certificate and ISO14001 environment management system certification. http://www.china-weldedpipe.com