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LE PROGRES CHARBONNIER
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LE PROGRES CHARBONNIER
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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
E21D11/14—Lining predominantly with metal
E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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FR1175338D1956-06-011957-05-17Perfectionnement aux cadres arqués pour galeries souterraines
ExpiredFR1175338A
(fr)