Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4836967 | Process for producing a joint for a framed structure | Erich Frantl | 1989-06-06 |
| 4822198 | Joint connection for frame structures | Erich Frantl, Willibald Zemler, Albert P. Raunicher, Werner Frantl | 1989-04-18 |