H-2 Bail Out oxygen bottle, complete with cover, tube and mouth piece, for fighter pilots and bomber aircrews. Dated January 1945 on neck. Army Air Forces marking on gage. Designed to provide 10 minutes of oxygen at high altitude in case of failure of the aircraft main oxygen system or to bail out if the airplane couldn't be taken to a lower altitude before abandoning it. Usually strapped on the thigh or parachute's harness.

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