Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5658211 | Interactive ball throwing game | — | 1997-08-19 |
| 4249508 | Spring assembly for ball throwing machines | Harold A. Keller | 1981-02-10 |
| 4220130 | Spring type ball throwing machine | Harold A. Keller | 1980-09-02 |