Top: Science: Technology: Aerospace: Aeronautics: Helicopters: History (3)

See also:

Helicopter History Site - This site traces the evolution of rotary wing aircraft back to Leonardo Da Vinci.
Helicopters and Autogiros 1939 to 1945 - Aviation history in the WWW: Index of aircraft by category and time period.
Igor I. Sikorsky Historical Archives, Inc. - Dedicated to acquiring, preserving and protecting the historical materials that chronicle the aviation careers of Igor Sikorsky, the companies he founded and the accomplishments of its employees.

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