| 摘要 |
PURPOSE: A dustproof nose mask is provided to maximize wearing sensation and to improve a filtering effect. CONSTITUTION: A dustproof nose mask comprises a U-shaped tongs unit(1) which covers the partition wall of nose, a connection rod(2) which is installed on the front end of two branch units, and a filter(3) which is installed in the connection rod. The filter comprises a hemispheric upper filter(31) and a wet plate sieve(32) which is installed in the lower part of the upper filter. |
