TREA

for step-by-step extension of the prop

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Industry

  • CPC
  • E21D15/526
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Parent Industries

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

Current Industry

E21D15/526for step-by-step extension of the prop
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    3712572
    • Patent number 3,712,572
    • Issue date Jan 23, 1973
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1521764
    • Patent number 1,521,764
    • Issue date Jan 6, 1925
    • B66 - HOISTING LIFTING HAULING

Patents Applicationslast 30 patents