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- In 1918, these two engineers were first to introduce the co-axial design of helicopters, where rotors are at the top of the aircraft.
Question 1:
In 1918, these two engineers were first to introduce the co-axial design of helicopters, where rotors are at the top of the aircraft.
A. Juan de la Cierva and Arthur Young
B. Jan Bahyl and Louis Brequet
C. Theodore von Karman and Asboth Oszkar
D. Paul Cornu and Emile Berliner
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