TREA

with individual advancing shifting devices

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Industry

  • CPC
  • E21D23/0056
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Parent Industries

EFIXED CONSTRUCTIONS E21Mining E21DSHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS E21D23/00Mine roof supports for step- by- step movement

Current Industry

E21D23/0056with individual advancing shifting devices
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Mine roof supporting
    • Patent number 4,026,116
    • Issue date May 31, 1977
    • Carnegie Mellon University
    • John Charles Purcupile
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3628335
    • Patent number 3,628,335
    • Issue date Dec 21, 1971
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3106825
    • Patent number 3,106,825
    • Issue date Oct 15, 1963
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents