| http://www.w3.org/ns/prov#value | - gas from the mask cavity; and manually operable means attached to said valve means for sliding the valve means, located outside of the mask cavity at a position where it is always outside the goggle cavity so that it can be manually operated at all times including times when the goggle means is fitted to the face in its said normal position; whereby when the goggle means is placed over the user's
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