File:Barnhart Tractor Biplane (1916) Aviation and Aeronautical Engineering September 1,1916.jpg
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![File:Barnhart Tractor Biplane (1916) Aviation and Aeronautical Engineering September 1,1916.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/6/69/Barnhart_Tractor_Biplane_%281916%29_Aviation_and_Aeronautical_Engineering_September_1%2C1916.jpg/800px-Barnhart_Tractor_Biplane_%281916%29_Aviation_and_Aeronautical_Engineering_September_1%2C1916.jpg?20190601185223)
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