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1、Butterfl y Valves: Double Flanged, Lug- and Wafer-Type API STANDARD 609 SIXTH EDITION, MAY 2004 Copyright American Petroleum Institute Reproduced by IHS under license with API Not for ResaleNo reproduction or networking permitted without license from IHS -,-,- SPECIAL NOTES ? ? ? ? ? ?!? ? ? ? ? ? “
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4、duced by IHS under license with API Not for ResaleNo reproduction or networking permitted without license from IHS -,-,- CONTENTS ? ? ? D? /-!?5?6?:?B?%?%?F?3?%?8? ?%1-?3?/4 ?3?5?F? ?3?/ vi Copyright American Petroleum Institute Reproduced by IHS under license with API Not for ResaleNo reproduction or networking permitted without license from IHS -,-,- NOTES TO PURCHASER 1 ? ? ? ? 2 ? ?!? ?%?+)C?(?/?*?
