TIS 2171.2-2004 Rockwell hardness test for metallic materials.part 2: verification and calibration of testing machines (scales a, b, c, d, e, f, g, h, k, n, t)
2005TIS 2171.2-2004 Rockwell hardness test for metallic materials.part 2: verification and calibration of testing machines (scales a, b, c, d, e, f, g, h, k, n, t)