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Principle of the helicopter, drawing by Leonardo da Vinci

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Principle of the helicopter, drawing by Leonardo da Vinci

Author
La Navigation Aérienne L'aviation Et La Direction Des Aérostats Dans Les Temps Anciens Et Modernes (Air Navigation Aviation And The Direction Of Aerostats In Ancient And Modern Time)
by Gaston Tissandier
Published in 1886
Available from gutenb
Dimensions
450*314
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1619
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