1998DS/EN 60672-3:1998 Ceramic and glass-insulating materials - Part 3: Specifications for individual materials
1986DS/IEC 672-3:1986 Specification for ceramic and glass insulating materials. Part 3: Individual materials
DS/IEC 672-3:1986 Specification for ceramic and glass insulating materials. Part 3: Individual materials was changed to DS/EN 60672-3:1998 Ceramic and glass-insulating materials - Part 3: Specifications for individual materials.