Type A-8B Oxygen Mask
Standardized in 1940, the Type A-8 oxygen mask was similar in design to the Type A-7 mask but covered the nostrils and mouth. The Type A-8B differed from the A-8 in having two exhaust posts set on either side of the nose instead of one on the main line. It also had space for a microphone. The Type A-8B continued to be used from many years after World War II.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.