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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 apparatus and method
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Patent number 4,967,778
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Issue date Nov 6, 1990
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Allied-Signal Inc.
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Larry K. Ball
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Butterfly valve apparatus and method
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Patent number 4,964,431
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Issue date Oct 23, 1990
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Allied-Signal Inc.
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Larry K. Ball
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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 4,964,422
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Issue date Oct 23, 1990
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Allied-Signal Inc.
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Larry K. Ball
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Butterfly valve apparatus and method
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Patent number 4,962,783
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Issue date Oct 16, 1990
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Allied-Signal Inc.
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Larry K. Ball
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...