Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873994 | Device for determining the forces in the area of the contact surfaces between a spectacle frame and the head of the wearer | Wilhelm Anger | 1989-10-17 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873994 | Device for determining the forces in the area of the contact surfaces between a spectacle frame and the head of the wearer | Wilhelm Anger | 1989-10-17 |