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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21/00
Anchoring-bolts for roof, floor; in galleries or longwall working; , or shaft-lining protection
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E21D21/0026
characterised by constructional features of the bolts
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E21D21/0053
Anchoring-bolts in the form of lost drilling rods
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