Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4817952 | Electronic spatial logical toy containing movable and/or rotatable elements | Robert Breitner, Gabor Fazekas, Istvan Hejjas, Peter Niklai, Erno Rubik +2 more | 1989-04-04 |