Patent classifications
E
FIXED CONSTRUCTIONS
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E21
EARTH OR ROCK DRILLING; MINING
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E21D
SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
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7/00
Shaft equipment, e.g. timbering within the shaft
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E21D7/02
Arrangement of guides for cages in shafts; Connection of guides for cages to shaft walls
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