GOST 8.129-1983 State system for ensuring the uniformity of measurements. State primary standard and state verification schedule for means measuring time and frequency
2013GOST 8.129-2013 State system for ensuring the uniformity of measurements. State verification schedule for means measuring time and frequency
1999GOST 8.129-1999 State system for ensuring the uniformity of measurements. State verification schedule for means measuring time and frequency
1983GOST 8.129-1983 State system for ensuring the uniformity of measurements. State primary standard and state verification schedule for means measuring time and frequency