TREA

acting on a firm abutment adapted thereto

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Industry

  • CPC
  • E21D23/083
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Parent Industries

EFIXED CONSTRUCTIONS E21Mining E21DSHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS E21D23/00Mine roof supports for step- by- step movement

Current Industry

E21D23/083acting on a firm abutment adapted thereto
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Mine roof support assembly
    • Patent number 4,526,495
    • Issue date Jul 2, 1985
    • Gewerkschaft Eisenhutte Westfalia
    • Kunibert Becker
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine-roof support
    • Patent number 4,380,410
    • Issue date Apr 19, 1983
    • Hermann Hemscheidt Maschinenfabrik GmbH & Co.
    • Hans Bull
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roof support assembly
    • Patent number 4,184,791
    • Issue date Jan 22, 1980
    • Gewerkschaft Eisenhutte Westfalia
    • Kunibert Becker
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Shield-type support assemblies for mine workings
    • Patent number 4,075,857
    • Issue date Feb 28, 1978
    • Gewerkschaft Eisenhutte Westfalia
    • Burckhardt Elsner
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2644311
    • Patent number 2,644,311
    • Issue date Jul 7, 1953
    • E21 - EARTH DRILLING MINING