Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867447 | System for determining performance on an exercise rowing machine | — | 1989-09-19 |
| 4809972 | Exercise machine with multiple exercise stations | Robert A. Rasmussen, William MacLean, Arthur B. Ish III | 1989-03-07 |