警报信号与警报器材 Jingbao xinhao yu jingbao qicai Designer Designer unknown (未知) Date ca. 1971 Publisher Beijingshi renmin fangkong zhihuibu (北京市人民防空指挥部) Size 53x76 cm. Call nr. BG E35/683 Collection IISH collection Theme People's air defense common knowledge posters (ca. 1971) After the Attack (1971)