Standard Specification for Aluminum and Aluminum-Alloy Extruded Round Tubes for General-Purpose Applications1
This wellknown is issued under the fixed designation b 491/b 491m; the range right away following the designation indicates the 12 months of authentic adoption or, inside the case of revision, the yr of closing revision. A number of in parentheses indicates the 12 months of remaining reapproval. A superscript epsilon (e) shows an article alternate since the closing revision or reapproval.
This popular has been authorized for use by means of companies of the branch of defense.
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