FAQs
SS 249:1981 (2017) [Mature]
IEC 60133:1961 [Revised]
IEC 60133:1967 [Revised]
IEC 60133:1985 [Revised]
IEC 60133A:1970 [Revised]
IEC 60133B:1971 [Revised]
IEC 60133B:1971/AMD1:1975 [Revised]
IEC 60205:1966 [Revised]
IEC 60205:1966/AMD1:1976 [Revised]
IEC 60205:1966/AMD2:1981 [Revised]