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20h 2min, sep 14, 1939 y - World’s 1st practical helicopter, the VS-300 designed by Igor Sikorsky
Added to timeline:
Timeline of 1939
By
Abraham Grahqm
31 Aug 2017
0
0
811
Date:
20h 2min, sep 14, 1939 y
Now
~ 86 years ago
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