There is disclosed an emergency escape breathing apparatus comprising a hood to be placed over a person's head and a pressured bottle supply of air or oxygen enriched air. The hood is formed of thin film, clear plastics having an elastic neck band to permit the hood to be pulled over the wearer's head,...http://www.google.es/patents/US4233970?utm_source=gb-gplus-sharePatente US4233970 - Emergency escape breathing apparatus
