bn:02325569n
Noun Concept
Categories: Tunnel boring machines
EN
tunnelling shield  Greathead shield  tunneling shield  tunnelling shields
EN
A tunnelling shield is a protective structure used during the excavation of large, man-made tunnels. Wikipedia
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EN
A tunnelling shield is a protective structure used during the excavation of large, man-made tunnels. Wikipedia
protective structure used during the excavation of tunnels Wikidata
Wikipedia
Wikidata