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The present tower mill was built by millwright Christiaan Bremer of Middelstum , Groningen , with the foundation stone being laid on 5 March 1905 .
 Middelstum, Groningen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Middelstum, Groningen