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Devices or apparatus specially adapted for handling or placing units of linings or supporting units for tunnels or galleries
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Industry
CPC
E21D11/40
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Parent Industries
E
FIXED CONSTRUCTIONS
E21
Mining
E21D
SHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS
E21D11/00
Lining tunnels, galleries or other underground cavities
Current Industry
E21D11/40
Devices or apparatus specially adapted for handling or placing units of linings or supporting units for tunnels or galleries
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