Standard Speciﬁcation for Primary Zirconium1
This preferred is issued beneath the ﬁxed designation b 494/b 494m; the wide variety immediately following the designation shows the 12 months of unique adoption or, within the case of revision, the 12 months of remaining revision. A variety of in parentheses suggests the 12 months of last reapproval. A superscript epsilon (e) suggests an article change because the remaining revision or reapproval.
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