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The filtration efficiency was 74% for a 2-layer woven nylon mask with ear loops (easy masks llc) with an aluminum nose bridge and nonwoven filter insert which, interestingly, had a slightly higher filtration efficiency after being washed once, 49.9% for a folded, cotton bandana, 39.3% for a single-layer woven polyester/nylon mask with ties ...

Machine element or mechanism 075 specialized metallurgical processes, compositions for use therein, consolidated metal powder compositions, and loose metal particulate mixtures

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