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| Author | ITU |
|---|---|
| Editor | ITU |
| Document type | Standard |
| Format | File |
| ICS | 33.020 : Telecommunications in general
|
| Number of pages | 12 |
| Year | 1980 |
| Document history | |
| Country | Switzerland |
| Keyword | CCITT T.561;ITU-T 561;561 |