GOST 8.064-1979 State system for ensuring the uniformity of measurements. The state special standard of unit of hardness on rockwell and super-rockwell scales
1994GOST 8.064-1994 State system for ensuring the uniformity of measurements. State verification shedule for means measuring hardness on Rockwell and Super-Rockwell scales
1979GOST 8.064-1979 State system for ensuring the uniformity of measurements. The state special standard of unit of hardness on rockwell and super-rockwell scales