Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4643567 | Device for controlling the position of a tunnelling machine | Alfred Zitz | 1987-02-17 |
| 4591209 | Protecting device for partial-cut cutting machines | Otto Schetina, Herwig Wrulich, Alfred Zitz | 1986-05-27 |
| 4578627 | Device for correcting the control or the display of the position of a cutting tool of a cutting machine | Alfred Zitz | 1986-03-25 |
| 4261617 | Method of controlling the working motion of a cutting tool of a tunnel-driving machine over the breast, and apparatus for carrying out the method | Alfred Zitz | 1981-04-14 |