Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882806 | Counterbalancing torsion spring mechanism for devices which move up and down and method of setting the torsion springs thereof | — | 1989-11-28 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882806 | Counterbalancing torsion spring mechanism for devices which move up and down and method of setting the torsion springs thereof | — | 1989-11-28 |