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Keywords: NMAH DC - IMG 8875.JPG 10-horsepower steam turbogenerator designed by Carl G P De Laval Sweden exhibited in 1893 at the World's Columbian Exposition in Chicago Exhibit in National Museum of American History Washington DC USA self-photographed 2011-01-18 Daderot Mechanical equipment in the National Museum of American History De Laval steam turbines Items displayed at the World's Columbian Exposition 1893 |