2014GOST 13047.6-2014 Nickel. Cobalt. Method for determination of carbon
2002GOST 13047.6-2002 Nickel. Cobalt. Methods for determination of carbon
1981GOST 13047.2-1981 Nickel. Methods for the determination of carbon
0000 GOST 13047.2-1967
GOST 13047.2-1981 Nickel. Methods for the determination of carbon was changed to GOST 13047.6-2002 Nickel. Cobalt. Methods for determination of carbon.