sigh007 发表于 2012-3-29 11:51:12

MIL-S-7493B (NOTICE 1)


                   MIL-S-7493B (NOTICE 1), MILITARY SPECIFICATION: STEEL BARS, ALLOY, CARBURIZING, 4615, 4617, & 4620, AIRCRAFT, QUALITY (31 MAY 1984) .         
         
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