Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4844554 | Empty-load valve device | — | 1989-07-04 |
| 4842341 | Brake pipe pressure modulating valve device | Lawrence E. Vaughn, Thomas H. Engle | 1989-06-27 |
| 4798420 | Fluid brake control system for railroad vehicles | — | 1989-01-17 |