Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4855566 | Process for striking an arc in electric welding and welding torch employing said process | Jean-Francois Hays, Pierre Legrand, Eric Verna, Michel Delzenne, Pierre Gaillard | 1989-08-08 |