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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E21D20/02
with provisions for grouting
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E21D20/025
Grouting with organic components, e.g. resin
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E21D20/026
Cartridges; Grouting charges
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