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Butterfly-type check valve
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Patent number 5,056,557
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Issue date Oct 15, 1991
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Allied-Signal Inc.
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John N. Tervo
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Butterfly-type check valve
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Patent number 5,046,527
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Issue date Sep 10, 1991
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Allied-Signal Inc.
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John N. Tervo
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Balanced-torque butterfly valve
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Patent number 5,005,804
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Issue date Apr 9, 1991
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Allied-Signal Inc.
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Blaine W. Andersen
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Butterfly valve method and apparatus
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Patent number 5,000,213
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Issue date Mar 19, 1991
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Allied-Signal Inc.
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John N. Tervo
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Butterfly valve method and apparatus
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Patent number 4,995,414
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Issue date Feb 26, 1991
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Allied-Signal Inc.
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John N. Tervo
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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