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File:CovidMaskProba0d015.jpg Estimate of effect of face mask: compared to cases without mask. · April 19 (2020)(730 × 960 (33 KB)) - 22:28, 6 October 2020File:FischerF2.jpg Low-cost measurement of face mask efficacy for filtering expelled droplets during speech. Mask, name Description(1,280 × 1,277 (261 KB)) - 02:52, 8 October 2020File:FischerF3.jpg Low-cost measurement of face mask efficacy for filtering expelled droplets during speech. Mask, name Description(1,050 × 397 (115 KB)) - 02:53, 8 October 2020