Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867928 | Apparatus and a method for the production of ribbed pipes | Jyri Jarvenkyla | 1989-09-19 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867928 | Apparatus and a method for the production of ribbed pipes | Jyri Jarvenkyla | 1989-09-19 |