Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6614640 | Surge arrester | Stephan Hoffarth, Michael Hagemeister | 2003-09-02 |
| 6512312 | Method and a device for detecting the presence of personnel in underground mining | Peter Herkenrath | 2003-01-28 |