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A pair of enormous amplifiers used by the US Naval Air Service for... News Photo1920-1929,Air Force,Airfield,Airplane,Amplifier,Archival,Armed Forces,Audio Equipment,Black And White,Connection,Consumerproduct,Day,Human Role,Large,Listening,Males,Megaphone,Military,Navy,Night,North America,Old,Pair,Politics,Scale,Science and Technology,Searching,Speaker,USA,VerticalPhotographer Collection: Hulton Archive circa 1925: A pair of enormous amplifiers used by the US Naval Air Service for locating and contacting aeroplanes by day and night. (Photo by Hulton Archive/Getty Images)