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Avon Protection ST53 Twin Port Special Responder Kit Total Respiratory Protection System, Combines FM53 with advanced breathing apparatus for up to 60 Minute Applications - Dana Safety Supply
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Avon Protection Systems (APS) M53 U.S. Special Operations Gas Mask/ Respirator at SOFIC 2011 - YouTube
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Yep, I find the M53 to be a superior mask over the M45, better field of vision, more comfy : r/gasmasks
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