Standard Speciﬁcation for Steel Forgings, Carbon and Alloy, for Pinions, Gears and Shafts for Reduction Gears1
This wellknown is issued beneath the ﬁxed designation a 291; the wide variety straight away following the designation suggests the 12 months of original adoption or, in the case of revision, the yr of last revision. a range of in parentheses shows the yr of last reapproval. a superscript epsilon (e) shows a piece of writing exchange since the remaining revision or reapproval.
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