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This U.S. Military Emergency Breathing Apparatus was originally designed to supply a completely self-containing breathing environment in the event of atmospheric contamination by chemicals or other agents. The same design is seen used by petroleum plants, chemical plants, laboratories, mining operations and other similar industries.
Unlike a traditional gas mask, this Apparatus supplied new breathable air from a tank instead of trying to filter contaminated outside air. Positive pressure would have pushed back against any leaks in the system while the user hopefully made a quick escape. The included cylinder is supplied empty, and may or may not hold pressure.