Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4827800 | Multi-groove and spline connection between gear shaft of a rotary piston machine with internal axis and method of making such a multigroove spline connection | Poul H. H. Pedersen | 1989-05-09 |