Donn W. Duffey

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Pittsburgh, PA

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Patents Grantslast 30 patents

Information Patent Grant
Stem seal for tapered lubricated plug valves
- Patent number 4,619,283
- Issue date Oct 28, 1986
- Rockwell International Corporation
- E. Frederick Schoeneweis
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...