TREA

Frederick J. Dewson

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  • Figtree, New South Wales, AU
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Patents Grantslast 30 patents

  • Information Patent Grant

    Modular reusable overcast
    • Patent number 4,621,951
    • Issue date Nov 11, 1986
    • Frederick J. Dewson
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine ventilation door
    • Patent number 4,517,767
    • Issue date May 21, 1985
    • Frederick J. Dewson
    • E21 - EARTH DRILLING MINING