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E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
E21D9/04—Driving tunnels or galleries through loose materials; Apparatus therefor not otherwise provided for
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FR447926D1912-09-031912-09-03Procédé pour effectuer tous travaux souterrains, notamment à proximité des chaussées ou des voies ferrées
ExpiredFR447926A
(fr)