Issued Patents 1994
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5297544 | Respirator with inner half mask and pollutant indicator | Wolfgang May, Carl-Ernst van der Smissen, Gerhold Muhmel | 1994-03-29 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5297544 | Respirator with inner half mask and pollutant indicator | Wolfgang May, Carl-Ernst van der Smissen, Gerhold Muhmel | 1994-03-29 |