Issued Patents 2005
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6952996 | Remotely operated manhole cover for a tanker | David E. Sisk, Roger Breakfield, William Spencer | 2005-10-11 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6952996 | Remotely operated manhole cover for a tanker | David E. Sisk, Roger Breakfield, William Spencer | 2005-10-11 |