scientist aiming for perfect fitting facemask | University of Southampton
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Coronavirus: US 'wants 3M to end mask exports to Canada and Latin America'
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Coronavirus: 3M tells Trump halting exports would reduce number of masks
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To maximize protection against COVID, use a 3M N95 - Jan 13, 2022
Give FFP3 masks to NHS staff during Omicron, doctors say | Coronavirus | The Guardian
Covid: Masks upgrade cuts infection risk, research finds - BBC News
