Stock Photo: Thomas Edison, President Herbert Hoover, Henry Ford, Commemorating the 50th Anniversary of Electric Light, At Menlo Park Laboratory relocated to Greenfield Village, Dearborn, Michigan

Stock Photo: 255-18888 Thomas Edison, President Herbert Hoover, Henry Ford, Commemorating the 50th Anniversary of Electric Light, At Menlo Park Laboratory relocated to Greenfield Village, Dearborn, Michigan