Lamp caps and holders together with gauges for the control of interchangeability and safety -- Part 3: Gauges (IEC 60061-3:1969 + Ergänzungen A:1970 bis U:1997 + A20:1998 bis A55:2018, modified) (english version)
Lamp caps and holders together with gauges for the control of interchangeability and safety -- Part 3: Gauges (IEC 60061-3:1969 + supplements A:1970 to U:1997 + A20:1998 to A51:2015, modified) (english version)
Lamp caps and holders together with gauges for the control of interchangeability and safety -- Part 3: Gauges (IEC 60061-3:1969 + supplements A:1970 to U:1997 + A20:1998 to A51:2015, modified) (english version)
