TREA

Hans Lewer

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  • Witten-Annen, DE
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Patents Grantslast 30 patents

  • Information Patent Grant

    Process for lining tunnels
    • Patent number 4,247,221
    • Issue date Jan 27, 1981
    • Kali und Salz AG
    • Hans Lewer
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Process for suppressing dust in mines
    • Patent number 4,190,292
    • Issue date Feb 26, 1980
    • Chemische Fabrik Kalk GmbH
    • Harald Johannes
    • E21 - EARTH DRILLING MINING