Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE33052 | Compression release retarder with valve motion modifier | Raymond N. Queeneville | 1989-09-12 |
| 4838516 | Compression release retarder with valve motion modifier | Raymond N. Quenneville | 1989-06-13 |