Space Shuttle-era emergency oxygen mask made by the Sierra Engineering Co., designed to connect to a temporary oxygen supply in the event of smoke or noxious gas inside the spacecraft, with a label applied to the filter on the front: "P/N SDD11100275-301, S/N 1049." The oxygen valve, tubing, and connectors all remain intact. In fine condition.
Provenance: The Spaceflight America Museum and Science Center in Prince Frederick, MD.
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