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Popular Science 1941-12

Popular Science 1941-12.jpg Collier's 1932-10-08ThumbnailsCollier's 1932-10-08ThumbnailsCollier's 1932-10-08ThumbnailsCollier's 1932-10-08ThumbnailsCollier's 1932-10-08Thumbnails

Air defense guards listening for approaching planes using an acoustic amplifier / sound collector. "Guarding Our Coasts Against Night Bombers," and "Tanks Can Be Destroyed."



Source: Horton Family, Noblesville, Indiana

Restoration by: magscanner