TREA

D. Graham Ball

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  • North Vancouver, CA
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Patents Grantslast 30 patents

  • Information Patent Grant

    Method of backfilling pipeline trenches
    • Patent number 4,068,488
    • Issue date Jan 17, 1978
    • Rader Companies, Inc.
    • D. Graham Ball
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...