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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13/00
Transport specially adapted to underground conditions
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E21F13/04
Transport of mined material; in gravity inclines; in staple or inclined shafts
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