File:Soldier Wearing GSR General Service Respirator MOD 45154419.jpg - Wikimedia Commons
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File:Soldier Wearing GSR General Service Respirator MOD 45154422.jpg - Wikimedia Commons
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Two generations of British GSR masks - on the left, the modern General Service Respirator from 2011. On the right, the GSR MKV respirator, 1942 dated. : r/gasmasks