125848
Thereafter he conducted numerous studies , wrote a wide variety of papers and earned a number of patent s , including those for the aileron flight control , various types of motive power engines and their components such as propeller s , plus other works on solar heat , photography and more .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None