Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4711606 | Shaped (concrete) block for retaining walls and also a retaining wall | Gerhard Hagenah | 1987-12-08 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4711606 | Shaped (concrete) block for retaining walls and also a retaining wall | Gerhard Hagenah | 1987-12-08 |