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Date: 2013-06-26 23:20:51Inventors Otto Lilienthal Glider aircraft Percy Pilcher Balloon Wright brothers Ornithopter Montgolfier brothers George Cayley Aviation Transport Aeronautics | Aeronautics Educator Guide pdfAdd to Reading ListSource URL: www.nasa.govDownload Document from Source WebsiteFile Size: 100,72 KBShare Document on Facebook |