@AdithyaR_YXE @NjbBari3 There have been very comfortable N95s especially duck bills but numerous others too, available for many years, well before 2020.
The an earlier version of the Aura was authorized for public use against H1N1 in 2008. https://twitter.com/AeonCoin/s...
@AdithyaR_YXE@NjbBari3有非常舒适的N95，特别是鸭嘴兽，但也有很多其他的，在2020年之前很多年都有。
Aura的早期版本于2008年被授权用于对抗H1N1的公共用途。https://twitter.com/AeonCoin/s...