Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5868527 | Mine props | Richard G. King | 1999-02-09 |
| 5658099 | Prop headboard | Frans R. P. Pienaar, Peter J. Cook | 1997-08-19 |
| 5318387 | Yieldable load support | Frans R. P. Pienaar, Graham H. Clarke, Mark Howell, Richard G. King, Peter J. Cook | 1994-06-07 |
| 5149228 | Prop preloading apparatus | Frans R. P. Pienaar, Graham Clark | 1992-09-22 |