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Check valve
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Patent number 4,964,423
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Issue date Oct 23, 1990
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Nupro Company
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Theodore J. Gausman
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Check valve
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Patent number 4,856,555
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Issue date Aug 15, 1989
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Nupro Company
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Theodore J. Gausman
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Inflatable valve
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Patent number 4,840,191
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Issue date Jun 20, 1989
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Nupro Company
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Theodore J. Gausman
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Low pressure relief valve
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Patent number 4,790,348
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Issue date Dec 13, 1988
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Nupro Company
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Theodore J. Gausman
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...