Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4799510 | Valve for use in controlling the functions of mine roof supports | — | 1989-01-24 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4799510 | Valve for use in controlling the functions of mine roof supports | — | 1989-01-24 |