Stephen G. Ratkowski

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North East, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Non-rotating stem valve
- Patent number 4,778,150
- Issue date Oct 18, 1988
- Autoclave Engineers, Inc.
- Robert B. Pratt
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...