TREA

Hal I. Dunham

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  • Marion, OH, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Mining method and system
    • Patent number 4,453,770
    • Issue date Jun 12, 1984
    • Dresser Industries, Inc.
    • Thomas H. Dalrymple
    • E21 - EARTH DRILLING MINING