Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D332106 | Pair of binoculars | Alfred Hengst, Heinz Keiner, Heinrich Janke | 1992-12-29 |
| D332107 | Pair of binoculars | Alfred Hengst, Heinz Keiner, Heinrich Janke | 1992-12-29 |
| 4998357 | Binocular telescopr with radially acting compensating spring | Alfred Hengst, Heinz Keiner | 1991-03-12 |
| 4989963 | Binocular telescope with coupled joint focusing and uncoupled separate focusing | Alfred Hengst, Heinz Keiner | 1991-02-05 |