Nnwale isi ike a na-ahụkarị gụnyere: Rockwell Hardness (HR), Surface Rockwell Hardness (HR), Vickers Hardness (HV), Micro Vickers Hardness (HV), Knoop Hardness (HK), Brinell Hardness (HB) , Leeb hardness (HL) (nkwughachi usoro), ultrasonic hardness test (UCI), Shore hardness (SHORE).https://www.yukeriv...
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