LUFTFILTER, LYSKILDEANORDNING OG FREMGANGSMÅDE TIL LUFTFILTERFREMSTILLING
An air filter includes a first urethane portion made of polyurethane foam and having air permeability and a second urethane portion made of polyurethane foam and disposed so as to overlap with a part of the first urethane portion. The second urethane portion is higher in density than the first ureth...
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