Original U.S. WWII Navy Aircraft Breathing Apparatus "Blimp Rebreather" Hand Select:Yes Side of can is marked:

Side of can is marked:

Firearms Technical Branch

What about original German M31 liners and chinstraps

which eventually became the British Army's standard tank-mounted machine gun

Original U.S. WWII Navy Aircraft Breathing Apparatus "Blimp Rebreather" Hand Select:Yes Side of can is marked:Original Item: Developed in late 1930's by Mine Safety Appliance (MSA), these oxygen regenerating systems provided dirigible aviators with necessary flow of oxygen at higher altitudes. Used with USN C type breathing mask (not included). Chemical cylinder not included. This is a fascinating piece of history, high altitude bombing in late WWI with German zeppelins and allied blimps lead to the discovery that maintaining ships higher than 16,000 feet for