... Co., Ltd. Qingdao Histro Steel Tower Co., Ltd. And Qingdao Histro Steel Pipe Co.,Ltd Qingdao Histro Steel Tower Co., Ltd. is ... broadcasting television towers, all series of communication towers, electric iron towers, microwave towers, and steel structures. Since our company was ... in Beijing, Inner Mongolia, Chongqing and Xinjiang. The indexes of the towers, such as vertical degree, reach or exceed ...