Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881344 | Sleeve for plant germination substrate | Gunter Frey | 1989-11-21 |
| 4836984 | Dentures and alloys for use in same | Harry Schiwiora, Manfred Stumke, Werner Groll | 1989-06-06 |
| 4831855 | Flaring tool and apparatus equipped with a flaring tool | — | 1989-05-23 |