Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4548442 | Mobile mining machine and method | David B. Sugden, Bruce A. Waddell, James P. Kindsvater | 1985-10-22 |
| 4270876 | Method of lining a vertical mine shaft with concrete | James D. Eklund, Joseph M. Halter, Donald E. Rasmussen, Robert G. Sullivan | 1981-06-02 |