Standard Speciﬁcation for Niobium and Niobium Alloy Bar, Rod, and Wire1
This preferred is issued underneath the ﬁxed designation b 392; the wide variety immediately following the designation suggests the yr of original adoption or, in the case of revision, the year of last revision. A number of in parentheses shows the yr of ultimate reapproval. A superscript epsilon (e) shows a piece of writing trade because the ultimate revision or reapproval.
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