Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4878676 | Seal-flushing in centrifugal-pumps, improved methods and apparatuses | — | 1989-11-07 |
| 4850405 | Log delimbing and cutoff device | Ernest W. Johnson, David C. Pontrelli | 1989-07-25 |