Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4818019 | Tilt control mechanism, particularly for knee-tilt chair | — | 1989-04-04 |
| 4796950 | Tilt mechanism, particularly for knee-tilt chair | Donald L. Cool, Fred C. Liebertz | 1989-01-10 |