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This fourth supplement shall be inserted in the loose-leaf publication IEC 67.
| Author | IEC |
|---|---|
| Editor | CEI |
| Document type | Standard |
| Format | File |
| Edition | 2.0 |
| ICS | 31.100 : Electronic tubes |
| Number of pages | 12 |
| Cross references | BS 448-1 (1981-04-30), IDT |
| Year | 1970 |
| Document history | |
| Country | Switzerland |
| Keyword | IEC60067D;IEC 60067D:1977 |