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The efficiency of turbojet engines was still rather worse than piston engines , but by the 1970 s , with the advent of high-bypass turbofan jet engines ( an innovation not foreseen by the early commentators such as Edgar Buckingham , at high speeds and high altitudes that seemed absurd to them ) , fuel efficiency was about the same as the best piston and propeller engines .
 person: Edgar Buckingham
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Answer:
 person: Edgar Buckingham