Self-contain Breathing Apparatus

A portable respiratory closed or semi-closed device which provides oxygen and/or gas mixture to the user from self-contained cylinde (s) . It eliminates carbon dioxide from exhaled gas and adds to it oxygen and/or gas mixture in order to be breathed by the user. It primarily consists of one or more cylinder, an absorber canister, a breathing bag, and the like. Excludes breathing apparatus, self-contained and breathing apparatus, oxygen generating.