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What was the name of the first mass-produced helicopter designed by Igor Sikorsky?
Sikorsky R-1
Sikorsky R-2
Sikorsky R-3
Sikorsky R-4
Answer
The Sikorsky R-4 was the world's first mass-produced helicopter, designed by Igor Sikorsky. It was a modification of his earlier design, the Vought-Sikorsky VS-300.
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