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with rotary cutting tools
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CPC
E21D9/1006
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Parent Industries
E
FIXED CONSTRUCTIONS
E21
Mining
E21D
SHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS
E21D9/00
Tunnels or galleries, with or without linings Methods or apparatus for making thereof Layout of tunnels or galleries
Current Industry
E21D9/1006
with rotary cutting tools
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