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Face masks go high tech with built-in air sensors, HEPA filters and space-like designs | KTLA
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This reusable face mask uses a pleated HEPA filter to let you breathe 99.9% clean air - Yanko Design
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Will.i.am. and Honeywell Unveil $299 Face Mask - The New York Times
Conversion of self-contained breathing apparatus mask to open source powered air-purifying particulate respirator for fire fighter COVID-19 response - ScienceDirect