Miners Self Rescuers. These rescuers were only effective against smoke and carbon monoxide in cases of fires underground. They would NOT protect you against mine gases such as methane etc. The self rescuers came in two sizes, the smaller of the two was the first issue, (late 1960’s to the late 1970’s) it would give you approximately 1 hour protection …
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Out Of The Blue Artifacts A Library of a lifetime of collecting