Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4817786 | Drive arrangement for tramming conveyor | Thomas W. McCormick | 1989-04-04 |
| 4798279 | Mine haulage method and apparatus | Margaret A. Roberts, Harry J. Brown | 1989-01-17 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4817786 | Drive arrangement for tramming conveyor | Thomas W. McCormick | 1989-04-04 |
| 4798279 | Mine haulage method and apparatus | Margaret A. Roberts, Harry J. Brown | 1989-01-17 |