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E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
E21D15/60—Devices for withdrawing props or chocks
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FR685059D1929-11-161929-11-16Dispositif pour retirer les poteaux de soutènement formant étançons dans les remblais d'exploitations minières
ExpiredFR685059A
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