Helicopters

Item

Title
Helicopters
Subject
en Imagined technology & prototypes
en Airplanes and Zeppelins
Article Title and/or Image Caption
Helicopters - Rotating-wing aircraft exhibit desirable characteristics for national defense
Contributor
Alexander Klemin
Language
eng
Temporal Coverage
World War II
Date Issued
1940-09-01
pages
138
Rights
Public domain
References
Igor Sikorsky
Archived by
Stefano Furi