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https://plantureux.fr/21-01-2004-serge-plantureux-niepce-daguerre-or-talbot-or-the-quest-of-joseph-hamel-to-find-the-real-inventor-of-photography/
21.01.2004 Serge Plantureux : Niepce, Daguerre or Talbot ? Or The Quest of Joseph Hamel to Find the Real Inventor of Photography