| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 16 | |
| #2 | France | 1 | |
| #3 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Transport | |
| #3 | Machine tools | |
| #4 | Mechanical elements | |
| #5 | Measurement |
| # | Technology | |
|---|---|---|
| #1 | Aeroplanes | |
| #2 | Internal-combustion piston engines | |
| #3 | Supplying combustion engines | |
| #4 | Shafts | |
| #5 | Cylinders for combustion engines | |
| #6 | Punching metal | |
| #7 | Measuring distances | |
| #8 | Metal-working | |
| #9 | Cyclically operating valves | |
| #10 | Parachutes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hirth Hellmuth | 2 |
| Publication | Filing date | Title |
|---|---|---|
| GB489326A | Improvements in crank shafts built up from hollow metal parts |