TREA

David L. Gruller

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  • Houston, TX, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Holddown and packoff apparatus
    • Patent number 4,416,472
    • Issue date Nov 22, 1983
    • Smith International, Inc.
    • John H. Fowler
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Holddown apparatus
    • Patent number 4,408,783
    • Issue date Oct 11, 1983
    • Smith International Inc.
    • David L. Gruller
    • E21 - EARTH DRILLING MINING