Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6267536 | Sealing arrangement for tunnel segments | Siegfried Glang, Dieter Kassel | 2001-07-31 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6267536 | Sealing arrangement for tunnel segments | Siegfried Glang, Dieter Kassel | 2001-07-31 |