Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7476058 | Mining roof support frame with base skids lifting device | — | 2009-01-13 |
| 5190414 | Walking prop for mine tunnels | Hans-Ferdinand Bemmerl, Peter Kroninger, Peter E. Rose, Alfred Bollmann | 1993-03-02 |