|
| US4459981 | 20. Mai 1982 | 17. Juli 1984 | Auergesellschaft GmbH | Breathing bag for closed cycle respirator |
| US4964405 | 1. Sept. 1989 | 23. Okt. 1990 | E. I. du Pont de Nemours and Company | Emergency respiration apparatus |
| US6584976 | 24. Juli 1998 | 1. Juli 2003 | 3M Innovative Properties Company | Face mask that has a filtered exhalation valve |
| US6805124 | 12. Aug. 2002 | 19. Okt. 2004 | 3M Innovative Properties Company | Face mask that has a filtered exhalation valve |
