Contex Gasmask Extension Leaflet.

1940 Min. of Home Security leaflet ' The Civilian Container Extension Piece ( Contex )' giving instructions for attaching the Contex. The Contex was a filter that, due to fear of arsenical gases, began to supplement existing GC (general civilian) and CD (civilian duty) filters. Contex was attached to an existing filter via adhesive tape. What separates the Contex from its asbestos-wool predecessors was that the filtering matrix comprised a resinous-wool mixture that functioned by means of an electric charge.
Good, used condition, punched for filing.
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Code: 11769