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API Std 609 Errata
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API Std 609 Errata Errata to Butterfly Valves: Double-flanged, Lug- and Wafer-type, Eighth Edition
Amendment by American Petroleum Institute, 04/13/2017
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API Std 609 Errata Errata to Butterfly Valves: Double-flanged, Lug- and Wafer-type, Eighth Edition
Amendment by American Petroleum Institute, 04/13/2017