Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D301063 | Modular block | Antonio Risi | 1989-05-09 |
| 4815897 | Retaining wall system | Antonio Risi | 1989-03-28 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D301063 | Modular block | Antonio Risi | 1989-05-09 |
| 4815897 | Retaining wall system | Antonio Risi | 1989-03-28 |