Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4951493 | Method and apparatus for making a spiral pipe | Hermann Fragge, Ewald Westerkamp | 1990-08-28 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4951493 | Method and apparatus for making a spiral pipe | Hermann Fragge, Ewald Westerkamp | 1990-08-28 |