Review and Test of the Czechoslovakian CM4 Gas Mask made at the same time as the Czech M10 mask.
A clone of the Drager M65, it has the same issue of a poor chin section which can compromise the seal of the mask.
Tightening the straps fully will fix that issue but also make the mask very uncomfortable to wear.
Upon finishing the video I had a very difficult time removing the mask, and then the filter from the mask. The mask is currently disassembled because of this, whether or not I can repair it remains to be seen.
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