American inventor Thomas Alva Edison. Photograph. 03/08/1931. (Photo by Imagno/Getty Images) Der amerikanische Erfinder Thomas Alva Edison. Photographie. 3.8.1931. [Getty Images]

American inventor Thomas Alva Edison. Photograph. 03/08/1931. (Photo by Imagno/Getty Images) Der amerikanische Erfinder Thomas Alva Edison. Photographie. 3.8.1931.

Hulton Archive Imagno