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| International Standard Category: Optics and optical measurements |
JJG 452-2006 Verification Regulation of Black and White Step Tablet
黑白密度片检定规程 ;
| Category No.: | 17.18 | Valid Status: | superseded |
| Issued Organization: | AQSIQ | Issued Date: | 2006-12-8 |
| Implemented Date: | 2007-6-8 | Abolished Date: | |
| Superseded Standard.: | JJG 452-2021 |
Superseded Date: | 2022-6-8 |
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