Full color Helicopter Wall Charts and Posters.
Military Helicopter Recognition Poster.Full color helicopter poster 39'' x 27''
A Guide to the Sky Cloud Chart.Full color 25'' x 37''
This poster interprets some of the technical drawings that Igor Sikorsky submitted as part of his patent application for the helicopter, for which patent number 2,318,260 was awarded May 4, 1943.
Full color 18'' x 24''
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