Standard Test Method for Magnetic Properties of Magnetic Amplifier Cores1
This popular is issued below the fixed designation a 598/a 598m; the quantity at once following the designation indicates the yr of unique adoption or, in the case of revision, the 12 months of remaining revision. Various in parentheses suggests the 12 months of closing reapproval. A superscript epsilon (e) suggests an article trade because of the remaining revision or reapproval.
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You can also get ASTM A 597 – 87 International standard