TREA

Josef Welzel

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  • Wuppertal, DT
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Patents Grantslast 30 patents

  • Information Patent Grant

    Suspended valve control device
    • Patent number 4,073,150
    • Issue date Feb 14, 1978
    • Hermann Hemscheidt Maschinenfabrik
    • Josef Welzel
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Roof-supporting arrangement
    • Patent number 3,987,634
    • Issue date Oct 26, 1976
    • Hermann Hemscheidt Maschinenfabrik
    • Josef Welzel
    • E21 - EARTH DRILLING MINING