Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4847961 | Method and apparatus for stitch-machining deep cavities in metal workpieces | Nathaniel L. Field | 1989-07-18 |
| 4842450 | Method and apparatus for self-adjusting boring bar | Nathaniel L. Field | 1989-06-27 |