Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5135164 | Prestressed concrete railroad tie | Peter Auer, Helmut Lieske, Gunther Leykauf, Peter Plica | 1992-08-04 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5135164 | Prestressed concrete railroad tie | Peter Auer, Helmut Lieske, Gunther Leykauf, Peter Plica | 1992-08-04 |