File:Otto Lilienthal patent DE-1893-84417.png

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English: Patent filing, an addition to an earlier patent, for a glider of an important kind that Lilienthal flew and was later imitated by others
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Source Probably Lilienthal museum: http://www.museumnet.lilienthal-museum.de/digitalisate/l3941.pdf
Author Otto Lilienthal patent in Germany, filed 1893, approved 1895

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