Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5868527 | Mine props | Brian Peter Lewis | 1999-02-09 |
| 5435670 | Spacer assembly and method | Frans R. P. Pienaar | 1995-07-25 |
| 5318387 | Yieldable load support | Frans R. P. Pienaar, Graham H. Clarke, Brian Peter Lewis, Mark Howell, Peter J. Cook | 1994-06-07 |