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filter 4dMasker medis fivecare 4D Surgical – 4PLY filter merupakan masker Fashion 4PLY yang terdiri dari 4 Lapis Masker. Dengan Bahan Non Woven & Meltblown BFE 97-99%, sehingga sangatA four-dimension (4D) bidirectional dital filter, having a minimum number of delay elements, is presented. This filter, besides having a minimum number of delay elements, also has an