Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5617639 | Railroad maintenance vehicle reference system transducer | — | 1997-04-08 |
| 5605099 | Maintenance vehicle and method for measuring and maintaining the level of a railroad track | Dennis A. Sroka, Bruce W. Bradshaw, David Mathew Johnson | 1997-02-25 |