Standard Speciﬁcation for Electric-Resistance-Welded Coiled Steel Tubing for Gas and Fuel Oil Lines1
This trendy is issued underneath the ﬁxed designation a 539; the quantity straight away following the designation shows the year of unique adoption or, inside the case of revision, the 12 months of remaining revision. A variety of in parentheses shows the 12 months of last reapproval. A superscript epsilon (e) suggests an editorial exchange for the reason that last revision or reapproval.
This popularity has been authorized for use by companies of the branch of defense.
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