| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 9 | |
| #2 | France | 2 | |
| #3 | United Kingdom | 2 | |
| #4 | United States | 2 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Machine tools | |
| #4 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Mining | |
| #3 | Working stone | |
| #4 | Accessories for machine tools | |
| #5 | Rotary pistons |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hans Hundrieser | 2 |
| #2 | Hundrieser Hans | 2 |
| #3 | Stapf Alfred | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1422361A | Tubular rock drill | |
| GB176564A | Tubular rock drill | |
| GB171916A | Rock drilling machine | |
| US1486898A | Auger bit or drill |