E21F 1/08

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
9752436 Method and system for tunnel ventilation in normal conditions and in conditions of fireJan 25, 13Sep 05, 17PAVETIC, JOSIP, PAVETIC, SVIBOR,
9664399 Ventilator and blade thereforSep 09, 13May 30, 17CSR BUILDING PRODUCTS LIMITED
9644854 Rotor ventilatorSep 09, 13May 09, 17CSR BUILDING PRODUCTS LIMITED
4567817 Exhaust-gas offtake for a track-guided vehicle propelled by combustion-energyOct 27, 82Feb 04, 86DAIMLER-BENZ AKTIENGESELLSCHAFT
4344357 Apparatus for extending ventilating conduitsSep 02, 80Aug 17, 82Ruhrkohle AG, Maschinenfabrik Korfmann GmbH,
4200036 Ventilation system for automated mining machinesNov 07, 78Apr 29, 80The United States of America as represented by the Secretary of the Interior