Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875761 | Light curtain apparatus | — | 1989-10-24 |
| 4851913 | Picture recording apparatus | Heinrich Hippenmeyer | 1989-07-25 |
| 4798965 | Optical autocollimation measuring apparatus | Klaus Smetana | 1989-01-17 |