Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4928927 | Lifting mechanism for heavy street gratings | William R. Fredrick | 1990-05-29 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4928927 | Lifting mechanism for heavy street gratings | William R. Fredrick | 1990-05-29 |