Wilhelmina E. E. Johnston

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Boca Raton, FL, US

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Patents Grantslast 30 patents

Information Patent Grant
Air vent valve
- Patent number 7,270,146
- Issue date Sep 18, 2007
- Wilhelmina E. E. Johnston
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...