Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D304963 | Bicycle exercise stand | Robert Reasons, Mark J. Hoffenberg, Robert A. Walpert, James Lindsay | 1989-12-05 |
| 4834363 | Bicycle racing training apparatus | Mark J. Hoffenberg, Rob Reasons, Robert A. Walpert | 1989-05-30 |