Note 19 — Early Efforts
Reading edition
French patent issued to Barthelemy Thimonnier and M. Ferrand (who was a tutor at l’Ecole des Mines, Saint-Etienne, and helped finance the patent), July 17, 1830.
Reading edition
French patent issued to Barthelemy Thimonnier and M. Ferrand (who was a tutor at l’Ecole des Mines, Saint-Etienne, and helped finance the patent), July 17, 1830.