| http://www.w3.org/ns/prov#value | - l to cover the nose and mouth; a heat and moisture exchange assembly mounted to the shell and including a body having a primary air intake passageway and an exhaust passageway, said exhaust passageway including part of said intake passageway and having moisture exchanging means therein, said assembly including: a generally cylindrical central passageway serving as said primary air intake passagewa
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