|
| US3963021 | 9 Jul 1974 | 15 Jun 1976 | Secretary of State for Trade and Industry in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland | Respirators |
| US4052984 | 25 Mar 1976 | 11 Oct 1977 | E. D. Bullard Company | Plenum type air distribution system for head enclosure |
| US4207883 | 14 Jul 1978 | 17 Jun 1980 | Nuclear & Environmental Protection, Inc. | Hood assembly with noise filter |
| US4411264 | 25 Jul 1980 | 25 Oct 1983 | Nuclear Power Outfitters | Supplied air respirator |
| US4506667 | 6 Abr 1983 | 26 Mar 1985 | | Self-contained ventilator/resuscitator |
| US4768235 | 21 Abr 1987 | 6 Sep 1988 | | Cold weather mask and hood |
| US5003974 | 27 Oct 1989 | 2 Abr 1991 | | First-aid gas mask |
