Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4598509 | Method and apparatus for raising and lowering a telescoping mast | Cecil Jenkins, Dewayne G. Vogt | 1986-07-08 |
| 4587778 | Method and apparatus for erecting a drilling rig mast | Cecil Jenkins | 1986-05-13 |