TREA

in which a series of similarly shaped props are given almost equal load capacity by removable devices

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Industry

  • CPC
  • E21D15/589
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Parent Industries

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

Current Industry

E21D15/589in which a series of similarly shaped props are given almost equal load capacity by removable devices
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    3197244
    • Patent number 3,197,244
    • Issue date Jul 27, 1965
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3051431
    • Patent number 3,051,431
    • Issue date Aug 28, 1962
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2953343
    • Patent number 2,953,343
    • Issue date Sep 20, 1960
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents