| # | Country | Total Patents | |
|---|---|---|---|
| #1 | EPO (European Patent Office) | 4 | |
| #2 | South Africa | 3 | |
| #3 | China | 2 | |
| #4 | Hungary | 2 | |
| #5 | Australia | 1 | |
| #6 | Bulgaria | 1 | |
| #7 | Brazil | 1 | |
| #8 | India | 1 | |
| #9 | Norway | 1 | |
| #10 | New Zealand | 1 | |
| #11 | Poland | 1 | |
| #12 | Russian Federation | 1 | |
| #13 | Turkey | 1 | |
| #14 | United States | 1 | |
| #15 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Shafts | |
| #2 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Heiliger Martha-Catharina | 20 |
| #2 | Martha-Catharina Heiliger | 3 |
| Publication | Filing date | Title |
|---|---|---|
| CN1071994A | Hydraulic support of steelwork mine | |
| CN1050753A | Hydraulic steel props for mine | |
| ZA8907226B | Mine prop | |
| AU3842489A | Hydraulic steel mine-prop | |
| EP0117439A2 | Cross cap | |
| EP0117900A2 | Hinged cap for an underground support | |
| EP0117893A2 | Hinged cap for an underground support |