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- A pneumonic device for assisted breathing.
- Synonym: negative pressure ventilator
- 1953 October 19, “A Better Break for Polio Patients”, in LIFE, Time Inc, page 127:
- To a polio victim who can no longer breathe for himself nothing is more disheartening than the thought of spending every hour of his life flat on his back in an iron lung.
a pneumonic device for assisted breathing