Peter Tsai invented N95 masks. He’s come out of retirement to join the covid-19 fight. – The Washington Post

July 7, 2020

https://www.washingtonpost.com/lifestyle/2020/07/07/peter-tsai-n95-mask-covid/

This entry was posted on July 7, 2020 at 10:27 am and is filed under Clip.

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