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Photos from: Helicopters unlock mineral exploration



A photocopy of Leonardo da Vinci’s drawings of the first flying machine.A drawing of the wondrous first hot air balloon flight.Helicopter flying over a glacial valley in Alaska.Ukrainian aviator Igor Sikorsky story on his successful helicopter flight.

Library of Congress

Leonardo da Vinci's manuscripts on the flight of birds and various other subjects show some of the earliest drawings and designs for mechanical flight.



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