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Early gas masks, First World War, 1915, (1935). 'The Introduction of Chemical Warfare: one of the earliest patterns of gas-masks, pads of cotton-wool soaked in a solution of common washing-soda'. From "The Silver Jubilee Book - The Story of 25 Eventful Years in Pictures". [Odhams Press Ltd., London, 1935] (KEYSTONE/HERITAGE IMAGES/The Print Collector)