Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D304358 | Stair climbing exercise apparatus | Timothy O. Armstrong, David Smith | 1989-10-31 |
| D302451 | Stair climbing exercise apparatus | David Smith | 1989-07-25 |
| 4838543 | Low impact exercise equipment | Timothy O. Armstrong | 1989-06-13 |
| 4830362 | Full body, shock-free aerobic and anaerobic exercising machine for use in the standing position | — | 1989-05-16 |