Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877093 | Spring actuated power swivel support rollers | James E. Lynch, Leroy R. Rateike | 1989-10-31 |
| 4813498 | Active counterbalance for a power swivel during well drilling | James E. Lynch | 1989-03-21 |