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E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
E21D11/02—Lining predominantly with wood
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FR406495D1908-09-011909-08-26
Method and device for the construction of mine galleries
ExpiredFR406495A
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