Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4457468 | Railroad grade crossing construction | Edmund R. Fredrick | 1984-07-03 |
| 4449666 | Concrete railroad tie for supporting grade crossing panels | Edmund R. Fredrick | 1984-05-22 |
| 4267969 | Railroad grade crossing construction | Edmund R. Fredrick | 1981-05-19 |