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Keywords: Two-lense pigeon camera sketch from ILA book.png en Lateral view sectional view and pneumatic system of Julius Neubronner's patented pigeon camera with two lenses Richard Wachsmuth Denkschrift der Ersten Internationalen Luftschiffahrts-Ausstellung Ila zu Frankfurt a M 1909 Appeared 1910 Julius Neubronner 1852 “1932 1910 or earlier PD-old PD-old-75 Pigeons in aerial photography Cameras of Germany |