John T.H. Dempster, President of Edison Pioneers, examines model of generator with John E. Sloane, left, Thomas Edison's grandson, and Eugene Reel, Secretary of Edison Pioneers.
John T.H. Dempster, President of Edison Pioneers, examines model of generator with John E. Sloane, left, Thomas Edison's grandson, and Eugene Reel, Secretary of Edison Pioneers.
U.S. National Park Service
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