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| International Standard Category: Structure and structure elements |
QJ 648-1981 Louver Hole Pattern and Dimension Series
百叶窗孔型式及尺寸系列 ;
| Category No.: | 49.045 | Valid Status: | valid |
| Issued Organization: | Issued Date: | 1981-12-31 | |
| Implemented Date: | 1982-10-1 | Abolished Date: | |
| Superseded Standard.: | Superseded Date: |
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