Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D257852 | Rear screen motion picture projector | Norbert Schlagheck | 1981-01-13 |
| D257258 | Movie camera | Norbert Schlagheck | 1980-10-07 |
| D256468 | Photographic camera | Norbert Schlagheck | 1980-08-19 |