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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15/00
Methods or devices for placing filling-up materials in underground workings
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E21F15/02
Supporting means, e.g. shuttering, for filling-up materials
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E21F15/04
Stowing mats; Goaf wire netting; Partition walls
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