Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4824237 | Vision and hand/eye coordination exercising and testing machine | Harvey Ratner, Ronald Ratner, Glenn A. Seifert, Marvin Zaro | 1989-04-25 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4824237 | Vision and hand/eye coordination exercising and testing machine | Harvey Ratner, Ronald Ratner, Glenn A. Seifert, Marvin Zaro | 1989-04-25 |