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Keywords from Image Description:
Twolense pigeon camera sketch from ILA book cropped. en Sectional view and pneumatic system of Julius Neubronner's patented pigeon camera with two lenses Richard Wachsmuth Denkschrift der Ersten Internationalen LuftschiffahrtsAusstellung Ila zu Frankfurt Appeared Julius Neubronner or earlier File Twolense pigeon camera sketch