Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4361034 | Portable hardness tester | Roland D. Borgersen, deceased, James W. Lineberger | 1982-11-30 |
| 4312220 | Portable hardness tester | Roland D. Borgersen, deceased | 1982-01-26 |