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| International Standard Category: Information sciences |
GB/T 7156-1987 Codes of secret level for documents
文献保密等级代码 ;
| Category No.: | 01.140.20 | Valid Status: | superseded |
| Issued Organization: | Issued Date: | 1987-01-03 | |
| Implemented Date: | 1987-10-1 | Abolished Date: | |
| Superseded Standard.: | GB/T 7156-2003 Codes and identification of secret level for documents |
Superseded Date: | 2003-1-2 |
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