Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5513485 | Full-swinging cutter for reduction head | William S. O'Hagan, Sr., John P. O'Hagan | 1996-05-07 |
| 4837992 | Folded/telescoped drill rig mast for limited space platform | — | 1989-06-13 |
| 4828050 | Single pass drilling apparatus and method for forming underground arcuate boreholes | — | 1989-05-09 |
| 4578911 | Cantilevered mast drilling rig with single step erection | — | 1986-04-01 |