| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 32 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Engines, pumps and turbines | |
| #3 | Machine tools |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Non-positive-displacement pumps | |
| #3 | Safety devices | |
| #4 | Percussive tools | |
| #5 | Mining | |
| #6 | Siphons | |
| #7 | Shafts |
| # | Name | Total Patents |
|---|---|---|
| #1 | Graefer Dipl-Berging Albrecht | 27 |
| #2 | Pilgrim Alfred | 15 |
| #3 | Nuesse Dipl-Berging Hugo | 14 |
| #4 | Jahnke Albert | 7 |
| #5 | Kamm Dipl-Ing Willibald | 2 |
| #6 | Hermanns Dr-Ing Peter | 1 |
| #7 | Hethey Arthur | 1 |
| #8 | Kraetzschmar Harry | 1 |
| #9 | Binaut Ernest | 1 |
| #10 | Pfuhl Dipl-Berging Karl-Heinz | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE1177582B | Device for drilling explosive holes when sinking shafts and dies | |
| DE1086645B | Drill carriage with drill |