TREA

Graham H. Clarke

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  • Boksburg, ZA
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Patents Grantslast 30 patents

  • Information Patent Grant

    Prestressing of mine props
    • Patent number 5,669,739
    • Issue date Sep 23, 1997
    • HL&H Timber Products (Proprietary) Limited
    • Graham Heath Clarke
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine support system
    • Patent number 5,547,317
    • Issue date Aug 20, 1996
    • HL&H Timber Products (Pty) Limited
    • Mark Howell
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Yieldable load support
    • Patent number 5,318,387
    • Issue date Jun 7, 1994
    • H L & H Timber Products (Proprietary) Limited
    • Frans R. P. Pienaar
    • E21 - EARTH DRILLING MINING