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Lee de Forest's original exhibitor pass for the Louisiana Purchase Exposition, St. Louis, 1904. On front: "Louisiana Purchase Exposition, St. Louise, 1904, [number] 3399. Non Transferable" Pass issued to Lee de Forest, American De Forest Inc. Scientific Director, div: exhibits, dept: Elect, On back: photo of de Forest, and "the holder of this pass is entitled to use same after Sept.1, 1904, validating order having been filed with H. Norton Whise, Chief of Admissions."
Louisiana Purchase Exposition (1904 : Saint Louis, Mo.) World's fairs Wireless telegraph (LCSH) American De Forest Wireless Telegraph Co De Forest, Lee