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Valve with force generating element
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Patent number 9,677,679
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Issue date Jun 13, 2017
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Dresser, Inc.
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Roger Dale Danzy
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Pressure relief valve
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Patent number 5,623,962
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Issue date Apr 29, 1997
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Dresser Industries
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Roger D. Danzy
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Multi-media safety relief valve
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Patent number 5,515,884
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Issue date May 14, 1996
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Dresser Industries Inc.
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Roger D. Danzy
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Valve seal
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Patent number 4,848,729
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Issue date Jul 18, 1989
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Dresser Industries, Inc.
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Roger D. Danzy
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...