Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4776445 | Device for transferring the cup heap of debris onto a drift conveying means | Alfred Zitz, Siegfried Sigott | 1988-10-11 |
| 4613256 | Supporting frame | Alfred Zitz, Karl Lerchbaum, Werner Toferer | 1986-09-23 |
| 4197035 | Shield-carrying roof support unit | Gottfried Siebenhofer | 1980-04-08 |