2017SJ/T 2268-2018 Gyromagnetic polycrystalline ferrite material series
1983SJ 2268-1983 Series of gyromagnetic multi-crystal materials made of magnetic oxides
SJ 2268-1983 Series of gyromagnetic multi-crystal materials made of magnetic oxides was changed to SJ/T 2268-2018 Gyromagnetic polycrystalline ferrite material series.