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| International Standard Category: Mining and minerals |
GB 50471-2008 GB 50471-2008
煤矿瓦斯抽采工程设计规范;
| Category No.: | 73 | Valid Status: | superseded |
| Issued Organization: | AQSIQ; MOC | Issued Date: | 2008-12-15 |
| Implemented Date: | 2009-6-1 | Abolished Date: | |
| Superseded Standard.: | GB 50471-2018 (Coal Mine Gas Drainage Engineering Design Standard) |
Superseded Date: | 2018-9-1 |
| Tel: +86-10-8572 5655 | Fax: +86-10-8581 9515 | Email: coc@codeofchina.com | QQ: 672269886 |
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