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Tag: Hoverfly
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October 16, 1943 - The U.S. Navy's First Helicopter
from
"On This Day" In Engineering History
posted in
General Discussion
Pathfinder Tags:
Hoverfly
igor sikorsky
October 16
R-4
Sikorsky YR-4B
Created on
10/16/2007
10:25 AM
by
Steve Melito
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