Dustproof mask for geological exploration
The invention provides a dustproof mask for geological exploration. The dustproof mask comprises a mask body and is characterized in that the mask body is provided with a foam hole sieve screen, a filtering screen and a chemical processing layer; after primary filtering by the foam hole sieve screen...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Online-Zugang: | Volltext bestellen |
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