Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4844184 | Lock device for hollow stem augers | Leroy W. Janson, Richard Pirrami | 1989-07-04 |
| 4844489 | Chuck apparatus and method | Dan Hryhorcoff, Gary Powell | 1989-07-04 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4844184 | Lock device for hollow stem augers | Leroy W. Janson, Richard Pirrami | 1989-07-04 |
| 4844489 | Chuck apparatus and method | Dan Hryhorcoff, Gary Powell | 1989-07-04 |