Pictured is the Mine Safety Appliances Chemox 45 minute rebreather unit. These units were incredibly popular and were made and used for decades. : r/gasmasks
here's an old MSA rebreather set that is at my work. Anyone got any info on it? : r/gasmasks
Mask parts of Canadian MSA CHEMOX A4 OXYGEN BREATHING APPARATUS (L/M/S) | eBay
Photos MSA Chemox
The Chemox is a oxygen generating self contained breathing apparatus produced by Mine Safety Appliances Co.. Rebreathers like this one are used in areas in which the oxygen content in the air
Photos MSA Chemox
MSA All-Vision Diaphragm ChemOx | Gas Mask King
Miner's Oxygen Mask/Original Case, circa 1960 For Sale at 1stDibs | msa chemox mask, msa chemox rebreather mask, msa chemox oxygen breathing apparatus