Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6257671 | Device for protecting selective cutting machines against overload | Walter Leitner, Nikolaus Sifferlinger | 2001-07-10 |
| 5498069 | Bit holder with a detachably fixed bit bushing | Alfred Zitz, Roman Gerer | 1996-03-12 |
| 4555143 | Apparatus for cutting rock | Herwig Wrulich, Otto Schetina, Wilfried Maier | 1985-11-26 |
| 4404893 | Hydraulic mine prop | Siegfried Sigott, Heinrich Suessenbeck, Alfred Zitz | 1983-09-20 |
| 4344354 | Valve arrangement for controlling the stroke of a telescoping prop | Heinrich Suessenbeck, Rienhard Neuper, Alfred Zitz | 1982-08-17 |
| 4299517 | Mine roof supporting structure | Heinrich Suessenbeck, Alfred Zitz | 1981-11-10 |
| 4197035 | Shield-carrying roof support unit | Heinrich Sussenbeck | 1980-04-08 |