File:A two-horn system of acoustic location at Bolling Field, USA, in 1921.jpg
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A_two-horn_system_of_acoustic_location_at_Bolling_Field,_USA,_in_1921.jpg (425 × 297 pixels, file size: 51 KB, MIME type: image/jpeg)
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current | 16:38, 17 December 2012 | 425 × 297 (51 KB) | Digital (talk | contribs) | MsUpload |
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