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Re: Microns and Nanometers
Posted to Open Discussion Forum on 4/3/2020 6 Replies

And yet, a mask is only as good as the seal it establishes against the wearer's face. I see many people out in public who don't seem to be aware that the metal band (when there is one) is meant to be formed to the profile of your upper nose. And then there's b... Login to read more.

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