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Oskar Bider ( July 12 , 1891 in Langenbruck – July 7 , 1919 in Dübendorf ) was a Swiss aviation pioneer .
 Oskar Bider, Langenbruck, Dübendorf, Swiss
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Oskar Bider, Langenbruck, Dübendorf, Swiss