Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875818 | Screw having a sealing washer | — | 1989-10-24 |
| 4840083 | Device for dampening rotary motion | Robert A. Hagan | 1989-06-20 |
| 4833938 | Rotary motion dampener | Robert A. Hagan | 1989-05-30 |