Metallic materials - Rockwell hardness test (scales A, B, C, D, E, F, G, H, K, N, T) - Part 2: Verification and calibration of testing machines (ISO 6508-2:1999);
Metallic materials - Rockwell hardness test (scales A, B, C, D, E, F, G, H, K, N, T) - Part 2: Verification and calibration of testing machines (ISO 6508-2:1999);