Wednesday, July 5, 2017
The First Practical Helicopter – VS-300 Unit – The First
According to history, the first practical helicopter in the world is created by in September 14, 1939 and they recognize it as the VS-300 that took its initial flight at Stratford, Connecticut.
http://thefirst.website/2017/07/01/the-first-practical-helicopter-vs-300-unit/
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