Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5653388 | Method and apparatus for constructing a permanent railroad track | Dieter Pietschmann, Pierre-Olivier Boutin, Winfried Mohr, Gilles de Pontbriand, Franz Geissler | 1997-08-05 |