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The C3 gas mask is a full-face gas mask developed by the General Tire and Rubber company of Canada (GTR) in Canada. First manufactured in 1960, it was intended to replace the British Light Anti-Gas Respirator, which had been in use since 1943.
References
http://www.gasmaskforum.com/anybody-knowledgable-about-the-canadian-c3-mask-t638.html
http://mygasmaskcollection.blogspot.com/2008/06/gas-mask-collection.html