Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9279476 | Rope braking system | John D. Bell, William Allan von Dehl | 2016-03-08 |
| 5188050 | Convertible mast assembly | — | 1993-02-23 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9279476 | Rope braking system | John D. Bell, William Allan von Dehl | 2016-03-08 |
| 5188050 | Convertible mast assembly | — | 1993-02-23 |