TREA

Deutag Deutsche Tiefbohr-AG

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  • Bad Bentheim, DE
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Patents Grantslast 30 patents

  • Information Patent Grant

    Drilling derrick device
    • Patent number 4,862,973
    • Issue date Sep 5, 1989
    • Deutag Deutsche Tiefbohr-AG
    • Eckhard Voigts
    • E21 - EARTH DRILLING MINING