Alarm signals and alarm equipment

Jingbao xinhao yu jingbao qicai
Alarm signals and alarm equipment
ca. 1971
Beijingshi renmin fangkong zhihuibu (北京市人民防空指挥部)
53x76 cm.
BG E35/683

Nr. 13 of the set 'People's air defense common knowledge posters'.
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