Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4832106 | Production of castings containing steel tubes | Christoph Knoche, Wilhelm Sieweke | 1989-05-23 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4832106 | Production of castings containing steel tubes | Christoph Knoche, Wilhelm Sieweke | 1989-05-23 |