Qingdao Sangao Metal Structure Co.,Ltd is a corporate enterprise with independent legal entity,Website:http://www.china-weldedpipes.com, 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 â…¡ level installation, passing the ISO9001 quality management system certificate and ISO14001 environment management system certification.