Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4448350 | Railroad track stress transfer apparatus | — | 1984-05-15 |
| 4416337 | Drill head assembly | Donald L. DeVall, Hu D. DeVall | 1983-11-22 |
| 4382547 | Railroad tie plate and correctable shim | — | 1983-05-10 |
| 4373874 | Fluid actuated pump system | — | 1983-02-15 |
| 4260105 | Railroad tie plate and correctable shim | — | 1981-04-07 |