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| Author | AENOR |
|---|---|
| Editor | AENOR |
| Document type | Standard |
| Format | File |
| ICS | 25.040.40 : Industrial process measurement and control |
| Number of pages | 4 |
| Replace | UNE 21331:1975 |
| Cross references | IEC 381-1:1982 Identical |
| Year | 1980 |
| Document history | UNE 21331:1975 |
| Country | Spain |