资质认证
- IEC 60061:1952/AMD2:1956
- Amendment 2 - International recommendations regarding lamp caps and holders together with gauges for the control of interchangeability
- 1955-12-31
- IEC 60061:1952/AMD1:1953
- Amendment 1 - International recommendations regarding lamp caps and holders together with gauges for the control of interchangeability
- 1952-12-31
- IEC 60061:1952
- International recommendations regarding lamp caps and holders together with gauges for the control of interchangeability
- 1951-12-31
- IEC 60028:1925
- International standard of resistance for copper
- 1924-12-31
