Helicopter History - A brief history of the evolution of helicopters. Helicopter History Site - This site traces the evolution of rotary wing aircraft back to Leonardo Da Vinci. Helicopter Museum - Unique collection of helicopters along with volunteers working on the restoration of the aircraft. 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. Westpac Rescue Helicopter Service - A short history of s very interesting Helicopter Rescue service in Australia.
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