sigh007 发表于 2012-3-24 11:15:02

MIL-T-4638B


                   MIL-T-4638B, MILITARY SPECIFICATION, TESTERS, MATERIAL HARDNESS (ROCKWELL TYPE)  (15 FEB 1985)., This specification covers requirements for hardness testers for testing the hardness of ferrous and nonferrous metals.         
         
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