Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5511898 | Moveable manhole cover | Martin C. Pettesch, Christopher M. Andrews, Thomas G. Nelson, Joseph V. Milo | 1996-04-30 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5511898 | Moveable manhole cover | Martin C. Pettesch, Christopher M. Andrews, Thomas G. Nelson, Joseph V. Milo | 1996-04-30 |