Standard Speciﬁcation for Seamless Carbon-Molybdenum Alloy-Steel Boiler and Superheater Tubes1
This general is issued beneath the ﬁxed designation a 209/a 209m; the number right now following the designation suggests the yr of original adoption or, in the case of revision, the year of last revision. a range of in parentheses suggests the 12 months of closing reapproval. a superscript epsilon (e) indicates an article trade because the closing revision or reapproval.
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