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Keywords: Two-lense pigeon camera sketch from ILA book (cropped).png en 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 File Two-lense pigeon camera sketch from ILA book png PD-old PD-old-75 Uncategorized 2015 April 24 |