Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4850754 | Automatic drilling machine | Henry M. Thornton, John S. Thornton | 1989-07-25 |
| 4674925 | Gang drill and method for clearing patterns of holes in tubular members | Henry M. Thornton, John S. Thornton, Richard E. Plowman | 1987-06-23 |