TREA

for use in longwall working

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Industry

  • CPC
  • E21D17/04
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Parent Industries

EFIXED CONSTRUCTIONS E21Mining E21DSHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS E21D17/00Caps for supporting mine roofs

Current Industry

E21D17/04for use in longwall working
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    3408820
    • Patent number 3,408,820
    • Issue date Nov 5, 1968
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3364682
    • Patent number 3,364,682
    • Issue date Jan 23, 1968
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents