湯瑪斯愛迪生(Thomas Edison)正在展示他的電燈泡發明，亨利福特及法蘭西絲傑爾(Francis Jehl)在一旁觀看，1929年10月21日

出處: "Thomas Edison re-enacts his invention of the electric light bulb as Henry Ford and Francis Jehl look on, October 21, 1929." Photo courtesy of the Henry Ford Museum and Greenfield Village for "Henry Ford Museum and Greenfield Village," a Michigan Local Legacies project