Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4305683 | Tubular element for tunnel construction | Harald Wagner, Heinz Distelmeier, Alfred Schulter | 1981-12-15 |
| 4260194 | Method and device for producing underground cavities using a driving shield | Jürgen Decker, Heinrich Kluibenschedl, German Munding, Armin Sowa, Harald Wagner | 1981-04-07 |