TREA

spark-reducing

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Industry

  • CPC
  • E21D15/007
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Parent Industries

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

Current Industry

E21D15/007spark-reducing
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Mine prop construction
    • Patent number 4,192,479
    • Issue date Mar 11, 1980
    • Herbert Friebe
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2978353
    • Patent number 2,978,353
    • Issue date Apr 4, 1961
    • F42 - AMMUNITION BLASTING