Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9243456 | Earth drilling device | Franz-Josef Puttmann, Gerhard Völkel, Meinolf Rameil | 2016-01-26 |
| 9206682 | Boring element for a ground boring device | Franz-Josef Puttmann, Gerhard Völkel, Andreas Riekes, Frank Prutti | 2015-12-08 |