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David L. Butler

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  • Edmonds, WA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Quick lockable tilting hoist tackle
    • Patent number 4,832,392
    • Issue date May 23, 1989
    • Oberg Enterprises, Inc.
    • David L. Butler
    • B66 - HOISTING LIFTING HAULING
  • Information Patent Grant

    Tilting hoist tackle
    • Patent number 4,684,162
    • Issue date Aug 4, 1987
    • Oberg Enterprises, Inc.
    • David L. Butler
    • B66 - HOISTING LIFTING HAULING