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William Joseph Hammer ( February 26 , 1858 – March 24 , 1934 ) was an pioneer electrical engineer and aviator and he was president of the Edison Pioneers starting in 1908 .
 person: Joseph Hammer; person: Edison
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: Joseph Hammer, Edison 
Answer:
 person: Joseph Hammer; person: Edison