Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5375530 | Pipe crawler with stabilizing midsection | William T. Zollinger | 1994-12-27 |
| 5370006 | Piping inspection carriage having axially displaceable sensor | William T. Zollinger | 1994-12-06 |