Figure 1. Three types of N95 respirators.
(A) Duckbill-shaped HPR-R/HPR-S (Hogy Medical Co. Ltd, Tokyo, Japan). (B) Dome-shaped Hi-Luck 350 (Koken Ltd, Tokyo, Japan). (C) Three-panel flat-fold respirators 9211 (3M, St. Paul, Minnesota, MN, USA).
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