TREA

having a central part for making a pilot tunnel and a follow-up part for enlarging the pilot tunnel

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Industry

  • CPC
  • E21D9/113
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Parent Industries

EFIXED CONSTRUCTIONS E21Mining E21DSHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS E21D9/00Tunnels or galleries, with or without linings Methods or apparatus for making thereof Layout of tunnels or galleries

Current Industry

E21D9/113having a central part for making a pilot tunnel and a follow-up part for enlarging the pilot tunnel
Industries