File:Martin R rear Aviation and Aeronautical Engineering October 15,1916.jpg
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![File:Martin R rear Aviation and Aeronautical Engineering October 15,1916.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/f/fc/Martin_R_rear_Aviation_and_Aeronautical_Engineering_October_15%2C1916.jpg/799px-Martin_R_rear_Aviation_and_Aeronautical_Engineering_October_15%2C1916.jpg?20190611160022)
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