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Popular Science 1941-12
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Created on
Saturday 29 October 2011
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983
Tags
approach
,
detect
,
sound
,
warning
Albums
General Magazines
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Science and Technology Magazines
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Popular Science Monthly
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
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