Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5121919 | Game playing device | — | 1992-06-16 |
| D277768 | Slot machine | Martti I. Karkkainen | 1985-02-26 |
| 4487414 | Coin operated prize dispensing projecting game | Martti K/a/ rkk/a/ inen | 1984-12-11 |