Metallic materials - Knoop hardness test - Part 2: Verification and calibration of testing machines (ISO/DIS 4545-2:2015); German and English version prEN ISO 4545-2:2015
Metallic materials - Knoop hardness test - Part 2: Verification and calibration of testing machines (ISO 4545-2:2017); German version EN ISO 4545-2:2018— 29 стр.