82 years ago #Today, Igor Sikorsky demonstrated his helicopter invention to the public [video footage: buff.ly/2q7vndf] [read more: buff.ly/2WLKso3]
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The idea of taking off vertically, making the transition to horizontal flight to the destination, and landing vertically has been the dream of inventors for centuries.
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And here's the first mass-produced heli Sikorsky R-4 just few years later.
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