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Portrait Foto, Eduard Hagenbach-Bischoff (1833–1910)
Deutsch: Eduard Hagenbach-Bischoff (1833–1910), Fotografiert von Henri Veillon, Staatsarchiv Basel-Landschaft, Liestal, Schweiz.
Physicist Pierre Prévost - Public domain scenic engraving
Ref. Journal Officiel Illustré De L'Exposition Nationale Suisse Genève 1896
Otto Feuerlein 1913 - A painting of a man in a suit and tie
Otto Feuerlein (1863–1930), physicist and pioneer of incandescent light bulb development / Physiker, Elektrotechniker und Pionier der Glühlampen-Herstellung
Carl Dorno - A black and white photo of a man with a mustache
Fotografie von Carl Dorno Public domain photograph related to German history, free to use, no copyright restrictions image - Picryl description
Georges-Louis Le Sage - Public domain portrait engraving
Georges-Louis Le Sage