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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15/00
Props; Chocks; , e.g. made of flexible containers filled with backfilling material
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E21D15/50
Component parts or details of props
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E21D15/502
Prop bodies characterised by their shape, e.g. of specified cross-section
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