Keywords: Dubois and Francois' rock-boring machinery at St. Gothard tunnel.jpg es Máquina perforadora Dubois y Francois en el túnel de San Gotardo 1876-06-21 Engineering 1876-01-21 página 44 John Henry Rimbault ca 1820-1888 other versions PD-old-70-1923 Engineering 1876 Gotthard rail tunnel |