Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4293246 | Mine roof support structure | Werner Boer, Hans Lachner, Joerg-Michael Richter, Heinrich Schulte, Hans Warnke | 1981-10-06 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4293246 | Mine roof support structure | Werner Boer, Hans Lachner, Joerg-Michael Richter, Heinrich Schulte, Hans Warnke | 1981-10-06 |