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Prince Henry of Prussia and August Euler, preparing to fly in an aeroplane. Prince Henry (1862-1929) is at left, and the German aviator August Euler is at right. Prince Henry (born Albert Wilhelm Heinrich) was the younger brother of the German Emperor Kaiser Wilhelm II. Prince Henry's career was as a naval officer, but he also took flying lessons and received one of the first pilot licenses in Germany. Photograph from the Bain News Service.
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