10 thoughts on “Etude quantitative et qualitative: l’explication en video”

  1. away. It can be worn alone or over an N-95 mask for added protection if the user desires. It’s great for Healthcare Providers, Fire Fighters, EMTs and Law Enforcement Officers as well as anyone who works with the public.away.

  2. I have designed a Copper Surgical Mask for Virus Protection that is washable hot water or (with a little alcohol), reusable, breathable, adjustable and bendable to fit any sized face over the nose and mouth for a comfortable fit and saves money because there is no need to throw it

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