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A comment on Surgical masks reduce Covid-19 spread, large-scale Stanford study shows. Parent comment

Re:Surgical masks reduce Covid-19 spread, large-scale Stanfo... by Scoundreller on Friday September 03, 2021 @02:39PM (#28407768)
Also 3M 9502+ KN95 which was subsequently NIOSH N95 approved (but you had to pay more if you wanted the ones stamped for the US market).
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