TREA

the props being moved systematically

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Industry

  • CPC
  • E21D15/606
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Parent Industries

EFIXED CONSTRUCTIONS E21Mining E21DSHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS E21D15/00Props Chocks

Current Industry

E21D15/606the props being moved systematically
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    3295814
    • Patent number 3,295,814
    • Issue date Jan 3, 1967
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3077741
    • Patent number 3,077,741
    • Issue date Feb 19, 1963
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2677535
    • Patent number 2,677,535
    • Issue date May 4, 1954
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1517095
    • Patent number 1,517,095
    • Issue date Nov 25, 1924
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1450603
    • Patent number 1,450,603
    • Issue date Apr 3, 1923
    • E21 - EARTH DRILLING MINING