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ROBERT COURAU
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ROBERT COURAU
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E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
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Engineering & Computer Science
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Mining & Mineral Resources
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Life Sciences & Earth Sciences
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General Life Sciences & Earth Sciences
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Geochemistry & Mineralogy
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Geology
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FR528886A1920-12-211920-12-21Procédé et appareil pour la détermination du "coefficient de sécurité" dans l'atmosphère des mines de pétrole
ExpiredFR528886A
(fr)