sigh007 发表于 2012-3-31 17:53:34

MIL-S-22664B (AMENDMENT 1)


                   MIL-S-22664B (AMENDMENT 1), MILITARY SPECIFICATION: STEEL, STRUCTURAL SHAPES ALLOY, HIGH YIELD STRENGTH (HY-80 AND HY-100) (23 APR 1991) .         
         
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