With the help of encyclopediadubuque.org

http://www.encyclopediadubuque.org/index.php?title=HOFFMANN,_Albert_J. http://www.encyclopediadubuque.org/index.php?title=SINGER_MANUFACTURING_COMPANY http://www.encyclopediadubuque.org/index.php?title=P._HUGHES_AND_SON http://www.encyclopediadubuque.org/index.php?title=DUBUQUE_TURBINE_AND_ROLLER_MILL_COMPANY_(THE)

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