— R-4, the World’s First Mass-Produced Helicopter
Puzzle 8 of Famous Women in Science Hard Pack
Question is: — R-4, the World’s First Mass-Produced Helicopter
and the answer is: SIKORSKY
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Puzzle 8 of Famous Women in Science Hard Pack
Question is: — R-4, the World’s First Mass-Produced Helicopter
and the answer is: SIKORSKY