Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5133626 | Mobile stope support apparatus | Gregory Sleziak, John Barratt, Horst W. Kielmann, Raymond G. Tarr | 1992-07-28 |
| 4332339 | Web-advancing apparatus | Heinz Luedemann | 1982-06-01 |