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Donald E. Hargraves

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  • Pepperell, MA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Plug-in connector
    • Patent number 4,125,278
    • Issue date Nov 14, 1978
    • Donald E. Hargraves
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Solenoid valve
    • Patent number 4,102,526
    • Issue date Jul 25, 1978
    • Donald E. Hargraves
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...