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The B2g is a Yugoslav and Serbian industrial mask, probably designed somewhere in late 80's or early 90's.
It is an upgraded version of the earlier Yugoslav industrial B2 mask, featuring a voice diaphragm and a 40mm stanag thread. It's probably a copy of the MSA Ultravue/AUER s3.
It only comes in one size, and 2 different color versions are known: turquoise (with light grey plastic parts) and black (with black plastic parts) Тhe Panoramic lens is made from polycarbonates. The facepiece weights around 650 grams (without the filter)
It is still being used and produced in Trayal company in Крушевац