Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5137337 | Method for working steeply dipping vein ores with vertically downwards propagating pillars | Pentti Seppanen, Lars-Erik Aaro, David Lindqvist, Karl E. Marttala | 1992-08-11 |