3 ms·
And additionally, N95 and similar masks are "wasted" in a non-professional use: https://news.ycombinator.com/item?id=23957506 https://news.ycombinator.com/item
by jaclaz 6y ago
And additionally, N95 and similar masks are "wasted" in a non-professional use:
https://news.ycombinator.com/item?id=23957506 https://news.ycombinator.com/item?id=23957506