Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4862973 | Drilling derrick device | Eckhard Voigts, Hans H. Achilles, Adolf Haussler | 1989-09-05 |
| 4200159 | Cutter head, drill bit and similar drilling tools | Hermann Rathkamp, Klaus Katzorke, Rainer Jurgens | 1980-04-29 |