Erwin; Josiephine R.

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Farmington, NM, US

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Tapered rotary plug valve
- Patent number 4,442,996
- Issue date Apr 17, 1984
- Erwin; Josiephine R.
- Robert L. Erwin
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...

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