| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Austria | 2 | |
| #2 | Canada | 2 | |
| #3 | Switzerland | 2 | |
| #4 | Germany | 2 | |
| #5 | France | 1 | |
| #6 | United Kingdom | 1 | |
| #7 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machine tools | |
| #2 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Percussive tools | |
| #2 | Earth drilling |
| # | Name | Total Patents |
|---|---|---|
| #1 | Drill Company Pennsylvania Gas | 2 |
| #2 | Schmidt Lionel A | 1 |
| #3 | Schmidt Lionel Albert | 1 |
| #4 | Roberts Edmund Wilson | 1 |
| #5 | Somervell Charles Stuart | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB293856A | Improvements in impact tools | |
| US1841553A | Impact tool | |
| CA248898A | Impact tool | |
| DE544359C | Impact tool with piston hammer | |
| CA294774A | Impact tool |