Popular Mechanics 1916-01.jpg Popular Mechanics 1915-10ThumbnailsPopular Mechanics 1916-02Popular Mechanics 1915-10ThumbnailsPopular Mechanics 1916-02Popular Mechanics 1915-10ThumbnailsPopular Mechanics 1916-02Popular Mechanics 1915-10ThumbnailsPopular Mechanics 1916-02Popular Mechanics 1915-10ThumbnailsPopular Mechanics 1916-02
French WW1 soldiers shown listening to the sky to hear oncoming airplanes: Electric ears detect invading air craft.



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Source: ebay seller powerangers

Restoration by: magscanner