DIN EN 61249-7-1:1996-01
互连结构材料第7部分：约束芯材分规范集；第 1 节：铜/殷钢/铜 (IEC 61249-7-1:1995)
Materials for interconnection structures - Part 7: Sectional specification set for restraining core materials; section 1: Copper/Invar/copper (IEC 61249-7-1:1995); German version EN 61249-7-1:1995