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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
E21D15/50—Component parts or details of props
E21D15/51—Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
E21D15/512—Arrangement of valves
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Mining & Mineral Resources
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FR805130A1959-09-151959-09-15Dispositif de sécurité pour la commande d'un étançon hydraulique pour mine
ExpiredFR1244393A
(fr)