TREA

by means of power accumulators to be pre-charged by rock pressure

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Industry

  • CPC
  • E21D15/587
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Parent Industries

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

Current Industry

E21D15/587by means of power accumulators to be pre-charged by rock pressure
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    2985419
    • Patent number 2,985,419
    • Issue date May 23, 1961
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2888231
    • Patent number 2,888,231
    • Issue date May 26, 1959
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2888230
    • Patent number 2,888,230
    • Issue date May 26, 1959
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2872147
    • Patent number 2,872,147
    • Issue date Feb 3, 1959
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2753036
    • Patent number 2,753,036
    • Issue date Jul 3, 1956
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1964003
    • Patent number 1,964,003
    • Issue date Jun 26, 1934
    • B66 - HOISTING LIFTING HAULING