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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5/00
Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
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E21F5/08
Rock dusting of mines; Depositing other protective substances
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