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E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
E21D5/00—Lining shafts; Linings therefor
E21D5/04—Lining shafts; Linings therefor with brick, concrete, stone, or similar building materials
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FR424308D1910-02-181910-12-30Procédé et dispositif pour la construction et le renforcement des parois de tunnels, puits ou autres galeries
ExpiredFR424308A
(fr)