The thinker
This article is about a concept, not a mask.
This article has been written about something that is not a specific model of mask, but a concept relating to CBRN warfare or the engineering behind gas masks.

Term Definition
CBRN Chemical, Biological, Radiological, Nuclear - An update on NBC, putting emphasis on the increased focus on so-called "dirty bombs"
Tissot-tubes tubes inside a mask in which air flows both ways
Oral-nasal-cup A valved cup contained inside a mask covering the nose and mouth, to prevent fogging, and to reduce dead space
Respirator A device worn on the face to protect the user against inhalation of contaminants
Voice diaphragm A thin membrane on a mask which vibrates to better project a user's voice
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