Oxygen Delivery System: Room air is 21%..Oxygen mask may deliver up to 100% O2. Partial rebreather mask 8-11 L/m conserves about 1/3 of your exhaled air; should deflate slightly. Nonrebreather used to counteract smoke inhalation/ any short term therapy requiring 80-100% O2. Shouldn't deflate. No more than 3 L/m for COPD pts. Ventimask delivers exact low flow conc of O2. Provides air-O2 mixture.
WW1: Aviator's oxygen mask in position and ready to use. Note the handwritten caption on the photo. WW1 planes could not safely fly at 10,000 ft, ceiling for deploying oxygen masks, so the development of the device looked at the future.
Image result for public domain emergency oxygen mask illustrATION
1/6 Scale GI Joe Pilot Oxygen Mask
Reviva oxygen mask 1.5 oz 484
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World War II gunner wearing an oxygen mask as he stands before an open slot in a B-17 airplane firing his machine gun during the Battle of Guadalcanal by SGT Howard Brodie (1942-1943) [1024 x 704][OS]