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YB 421-1977 YB 421-1977_English: PDF (YB421-1977) Standard ID Contents [version] USD STEP2 [PDF] delivered in Standard Title (Description) Related Standard Status PDF YB 421-1977 English RFQ ASK 3 days (Chinese Industry Standard) YB 421-1977 Obsolete YB 421-1977 BASIC DATA Standard ID YB 421-1977 (YB421-1977) Description (Translated English) (Chinese Industry Standard) Sector / Industry Ferrous Metallurgy Industry Standard