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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

A drawn depiction of Jean François Pilâtre de Rozier and Marquis d'Arlandes making the first free aerial voyage in 1783 in a Montgolfier hot-air balloon in Paris, France.



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