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File:Leonardo da Vinci helicopter.jpg

Leonardo_da_Vinci_helicopter.jpg(363 × 268 pixels, file size: 39 KB, MIME type: image/jpeg)

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Leonardo da Vinci: Entwurf eines Helikopters

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Source ausschnitt aus http://commons.wikimedia.org/wiki/Image:Leonardo_da_Vinci_helicopter_and_lifting_wing.jpg
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