Patent classifications
E
FIXED CONSTRUCTIONS
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E21
EARTH OR ROCK DRILLING; MINING
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E21F
SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
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1/00
Ventilation of mines or tunnels; Distribution of ventilating currents
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E21F1/08
Ventilation arrangements in connection with air ducts, e.g. arrangements for mounting ventilators
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