Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5302056 | Method and apparatus for supporting a mine roof | Frank Calandra, Jr., Jerry E. Frease, Lajos Kovacs, John C. Stankus | 1994-04-12 |
| 5292209 | Bearing plate | Frank Calandra, Jr., John C. Stankus | 1994-03-08 |