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International Petroleum Co Bremer Vulkan of Bremen-Vegesack in northern Germany built C.O. Stillman , completing her in February 1928 .
 Bremer Vulkan, Stillman
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bremer Vulkan, Stillman