Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5373718 | Electronic lock cylinder connectable by a plug connector | Franz Schwerdt, Karl-Heinz Spahn, Dieter Wienert, Helmut Aswegen | 1994-12-20 |
| 4689620 | Method and apparatus for data transmission between a transmission and a receiver disposed in a drill hole and a transmitter and a receiver disposed above ground | — | 1987-08-25 |