Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4347020 | Mine roof bolt assembly | Frederick Carr | 1982-08-31 |
| 4342527 | Support assembly for underground mine and tunnel roofs | — | 1982-08-03 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4347020 | Mine roof bolt assembly | Frederick Carr | 1982-08-31 |
| 4342527 | Support assembly for underground mine and tunnel roofs | — | 1982-08-03 |