Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875739 | Independent continual quick service valve device | James E. Hart | 1989-10-24 |
| 4850654 | Freight brake emergency valve | James E. Hart, Theodore B. Hill | 1989-07-25 |
| 4830438 | Freight brake emergency valve | James E. Hart | 1989-05-16 |
| 4819993 | Freight brake control valve device having improved quick service function | Theodore B. Hill | 1989-04-11 |