Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4848964 | Apparatus for correcting irregularities in or enlarging an underground duct | — | 1989-07-18 |
| 4789268 | Device and method for removing irregularities in or enlarging an underground duct | — | 1988-12-06 |
| 4657436 | Device and method for removing irregularities in or enlarging an underground duct | — | 1987-04-14 |
| 4648454 | Robot | — | 1987-03-10 |
| 4602495 | Device and method for removing irregularities in or enlarging an underground duct | — | 1986-07-29 |
| 4487052 | Device and method for removing irregularities in or enlarging an underground duct | — | 1984-12-11 |