Face Mask vs Respirator Comparison by 3M - YouTube- สเปคหน้ากาก 3m 9502v ,Face or surgical masks look like N95 respirators, but they are quite different! Full details @ https:///science/face-masks-air-pollution/Tech ...Face Mask vs Respirator Comparison by 3M - YouTubeFace or surgical masks look like N95 respirators, but they are quite different! Full details @ https:///science/face-masks-air-pollution/Tech ...



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