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Haco Ges A G
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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
E21D15/14—Telescopic props
E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
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Pharmaceuticals Containing Other Organic And Inorganic Compounds
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Nitrogen Condensed Heterocyclic Rings
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FR741891A1956-09-131957-09-09Procédé pour la préparation de nouveaux dérivés de pyrazolidine, notamment de 1-pyridyl-3, 5 dioxo-pyrazolidines
ExpiredFR1231652A
(fr)