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This came in the mail today, thought I'd post. Here's my IP-4 closed circuit rebreather with a ShIP-2b(k) facepiece and a RP-4 regenerative canister : r/gasmasks
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Conversion of self-contained breathing apparatus mask to open source powered air-purifying particulate respirator for fire fighter COVID-19 response - ScienceDirect
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Insulating gas masks IP-4M and IP-5 and regenerative cartridges RP-4-01 and RP-5 - Board - Refrigeration Technology
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