Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5676471 | Dragline with improved thrust bearing assembly supporting upper structure | Harvey J. Kallenberger | 1997-10-14 |
| 5636459 | Dragline including improved boom | — | 1997-06-10 |
| 5603174 | Dragline including improved walking mechanism | Harvey J. Kallenberger | 1997-02-18 |