Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4855574 | Welding sleeve with connecting means having an upper and lower part | Roelof Koopman, Jan Visscher | 1989-08-08 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4855574 | Welding sleeve with connecting means having an upper and lower part | Roelof Koopman, Jan Visscher | 1989-08-08 |