TREA

Douglas B. Hughes

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  • Rideau Ferry, Ontario, CA
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Patents Grantslast 30 patents

  • Information Patent Grant

    Pipe thawing apparatus
    • Patent number 4,575,614
    • Issue date Mar 11, 1986
    • Douglas B. Hughes
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Pipe thawing apparatus
    • Patent number 4,314,140
    • Issue date Feb 2, 1982
    • Douglas B. Hughes
    • E03 - WATER SUPPLY SEWERAGE