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| International Standard Category: Other mining equipment |
MT 646-1997 Frictional metal prop
摩擦式金属支柱;
| Category No.: | 73.100.99 | Valid Status: | abolished |
| Issued Organization: | Ministry of Coal Industry | Issued Date: | 1997-11-10 |
| Implemented Date: | 1998-4-1 | Abolished Date: | 2017-11-10 |
| Superseded Standard.: | Superseded Date: |
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