Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4711502 | Apparatus for cutting excavations having a substantially planar face | Franz Barnthaler, Otto Schetina, Alfred Zitz | 1987-12-08 |
| 4664449 | Drift advancing or mining machine | Franz Barnthaler, Otto Schetina, Alfred Zitz | 1987-05-12 |
| 4662685 | Device for sealing a drift cross section driven by means of a cutting machine | Franz Barnthaler, Otto Schetina, Alfred Zitz | 1987-05-05 |