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.
coredumpproject:bodyfluids: Smog masks at QIAODAN Yin Peng S/S 15 China Fashion Week This makes me want to go through and rewatch all that bad sci-fi from the 90s. Apparently they were on to something.