STAS 7451-1988 Steel flanges Bl.lND FLANGESXP 6 NP 10 NP 16 NP 25 XP 40 NP 64 NP 100 and NP 160 Dimensions《钢法兰 盖板XP 6：NP 10、NP16：NP 25、XP 40、NP 64、NP100、NP 160尺寸 》.pdf

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