Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4820449 | Cleaning block for flush toilet tanks | Bernd-Dieter Holdt, Gerd Praus | 1989-04-11 |
| 4813084 | Cleaning system for toilet bowls | Herbert Buecheler, Thomas Capune, Bernd-Dieter Holdt, Erich Tuerk | 1989-03-21 |