Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6572082 | Railway boxcar door operating unit | Thomas E. Dixon, Brian Campbell, Richard R. Estep, Larry D. Marshal | 2003-06-03 |
| 4587751 | Wear cap style excavating tooth | Kaj Sjogren | 1986-05-13 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6572082 | Railway boxcar door operating unit | Thomas E. Dixon, Brian Campbell, Richard R. Estep, Larry D. Marshal | 2003-06-03 |
| 4587751 | Wear cap style excavating tooth | Kaj Sjogren | 1986-05-13 |