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Description

Nurse Redheart, conducting a lesson on how to not die horribly.

safe2276745 artist:dimfann1125 nurse redheart4627 earth pony549744 pony1710219 g42134534 dimfann's war universe26 duo208416 female1919089 filly105605 gas mask1974 lesson90 looking at each other38707 mare812743 mask10962 open mouth258810 ruins1736 smiling435173 war1692

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Background Pony #2B29
@Factory Yoshi  
This way you can have bigger and heavier filters that last longer, and you are carrying them in a special bag (and the bag itself acts as a very rough filter, so the real filter doesn’t get quickly jammed by big particles). Of course this is a rather old gasmask design.