Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4796619 | Lung-controlled valve for respirator masks having positive pressures inside the mask | — | 1989-01-10 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4796619 | Lung-controlled valve for respirator masks having positive pressures inside the mask | — | 1989-01-10 |