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Bull was the first of many destroyer escorts built at Defoe Shipbuilding Company , of Bay City , Michigan .
 Bull, Defoe Shipbuilding Company, Bay City , Michigan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bull, Defoe Shipbuilding Company, Bay City , Michigan