Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4829723 | Rail grinding machine | Alan Lee Dzubak, Darwin H. Isdahl | 1989-05-16 |
| 4713898 | Railroad mounted trench digger | Raymond C. Wahl | 1987-12-22 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4829723 | Rail grinding machine | Alan Lee Dzubak, Darwin H. Isdahl | 1989-05-16 |
| 4713898 | Railroad mounted trench digger | Raymond C. Wahl | 1987-12-22 |