Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5605099 | Maintenance vehicle and method for measuring and maintaining the level of a railroad track | William E. Perry, Bruce W. Bradshaw, David Mathew Johnson | 1997-02-25 |
| 5012413 | Railroad track curve lining apparatus and method | William E. Perry | 1991-04-30 |