Standard Specification for Steel Rivets and Bars for Rivets, Pressure Vessels1
This general is issued beneath the fixed designationa31; the quantity at once following the designation shows the 12 months of authentic adoption or, within the case of revision, the 12 months of closing revision. more than a few in parentheses suggests the year of closing reapproval. a superscript epsilon (e) shows a piece of writing change for the reason that final revision or reapproval
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