10.98 21 gush 1998
IEC
TC 1
International Standard
PUBLISHED
IEC 60050-531:1974 ED1
PUBLISHED
IEC 60050-531:1974/AMD1:2017 ED1
PUBLISHED
IEC 60050-531:1974/AMD2:2020 ED1
ABANDON
IEC 60050-531 ED2
10.98
New project rejected
21 gush 1998