Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873879 | Variable speed transmission | Roger P. Butterfield, Curt A. Wykstra | 1989-10-17 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873879 | Variable speed transmission | Roger P. Butterfield, Curt A. Wykstra | 1989-10-17 |