Standard Specification for General Requirements for Steel Plates for Pressure Vessels1
This popular is issued underneath the fixed designation a 20/a20m; the variety right now following the designation suggests the year of unique adoption or, inside the case of revision, the 12 months of remaining revision. More than a few in parentheses indicates the yr of final reapproval. A superscript epsilon (e) indicates a piece of writing change since the last revision or reapproval.
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