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Gate valve having a secondary seal
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Patent number 4,377,273
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Issue date Mar 22, 1983
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John Beson
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Guillotine type damper
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Patent number 4,338,960
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Issue date Jul 13, 1982
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Foster Wheeler Energy Corporation
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Ronald A. Ashdown
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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3282299
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Patent number 3,282,299
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Issue date Nov 1, 1966
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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2702178
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Patent number 2,702,178
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Issue date Feb 15, 1955
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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1727628
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Patent number 1,727,628
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Issue date Sep 10, 1929
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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1692496
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Patent number 1,692,496
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Issue date Nov 20, 1928
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...