The following is one of the technical problems that must be solved to adopt the utility model. Of a breathing mask is required such a fabrication between whose layers a structure of chemical combinations must be built, so that through the reaction of the polybasic acid activators in the structure and other compounds, the mask could function to absorb water, smell, give fragrance ,be health-giving ,germproof and to apparently raise its service efficiency.
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2007/10/27 11:31:00
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