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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
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Edgar Buckingham 
Answer:
 person: Edgar Buckingham