John F. Walter

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North Kingstown, RI, US

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Patents Grantslast 30 patents

Information Patent Grant
Ball valve having easy maintenance features for extreme environments
- Patent number 4,562,860
- Issue date Jan 7, 1986
- Wilmington Trust Company
- John F. Walter
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...