Polish MP4B Gas Mask Review

Assembly and review of the Polish MP4B Gas Mask, this mask was essentially the Polish MP4 cheek filter gas mask, a clone of the US M17 ABC mask but with a drinking tube feature added, interestingly this tube is in the chin of the mask and works incredibly well, better than most modern NATO masks.

The MP4B was supposedly made in very small numbers, 200-300 masks produced if that information is correct, the idea was for Polish troops to have a mask with a drinking tube feature, however the masks were quickly replaced by the MP5 respirator, made under license from France.
I am unsure if this mask was designed in the 80s or 90s but this particular model is from just after the fall of Communism.