USAAF Type A-14 Demand Oxygen Mask-This is a oxygen mask made of molded green rubber and fabric. This type of mask would be used by pilots and bomber crews to supply oxygen during flight, particularly at altitudes above 10,000 feet in unpressurized aircraft. It was manufactured by companies like Ohio Chemical and featured a ribbed hose, olive-colored straps, black metal fittings, and a recess for a communication microphone, though not originally integrated. Please be aware that this one has a very delicate hose attached.