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| View Original: | Dubois and Francois' rock-boring machinery at St. Gothard tunnel.jpg (1223x697) | |||
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| 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 | ||||
