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Standard Insuued on: 1987-05 |
Category No.: | GB | Valid Status: | superseded |
Issued Organization: | China State Bureau of Standards | Issued Date: | 1987-05-25 |
Implemented Date: | 1987-12-1 | Abolished Date: | |
Superseded Standard.: | GB/T 7962.18-2010 Test methods of colourless optical glass—Part 18:Knoop hardness |
Superseded Date: | 2011-5-1 |
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