Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4795133 | Ball valve with a ceramic valve ball and ceramic seat rings | Rutger Berchem, Georg Prokscha | 1989-01-03 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4795133 | Ball valve with a ceramic valve ball and ceramic seat rings | Rutger Berchem, Georg Prokscha | 1989-01-03 |