Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 4911579 | Swivel arrangement for connecting a boring or reaming tool to a cable | Mark E. Lutz, Douglas P. Kelley | 1990-03-27 | $650,000 |
| 4754526 | System including a multi-stepped nozzle assembly for back-boring an inground passageway | Olivier L. Tremoulet, Jr., ANDREW ARTHUR PAUL BURNS | 1988-07-05 | $194,000 |