"Helicopter's first public flight on Dec 18, 1992"
Credit - US Air Force Museum
Helicopter was built by Oehmichen
Credit - Hiller Aviation Museum
Oemichen's first attempt at vertical flight.
Bothezat's helicopter with six-bladed rotors
Credit - Library of Congress
Helicopter for observation.
First helicopter to liftoff with a pilot.
Pescara built several helicopters
Cornu's helicopter with counter-rotating rotors
The Berliner 1921 single-wing
Credit - Courtesy of Aerofiles
Helicopter lifted its own weight
Helicopter built by J.C.H. Ellehammer.
Cornu in his first helicopter.
Credit - ") 2001 Smithsonian Institution, National Air and Space Museum, Videodisc. 2B 5847"