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E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
E21F13/00—Transport specially adapted to underground conditions
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FR496349D1918-03-141918-03-14Procédé pour l'extraction, le transport et l'évacuation des déblais d'un tunnel sous-marin ou sous-fluvial
ExpiredFR496349A
(fr)