In 1918, these two engineers were first to introduce the co-axial design of helicopters, where rotors are at the top of the aircraft.
- Juan de la Cierva and Arthur Young
- Jan Bahyl and Louis Brequet
- Theodore von Karman and Asboth Oszkar
- Paul Cornu and Emile Berliner
Answer
The correct answer is C) Theodore von Karman and Asboth Oszkar.
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