| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 10 | |
| #2 | United Kingdom | 2 |
| # | Industry | |
|---|---|---|
| #1 | Transport | |
| #2 | Engines, pumps and turbines | |
| #3 | Surface technology and coating | |
| #4 | Mechanical elements | |
| #5 | Agriculture |
| # | Technology | |
|---|---|---|
| #1 | Vehicle brake control systems | |
| #2 | Vehicle transmission mounting | |
| #3 | Cooling of machines | |
| #4 | Gearing | |
| #5 | Aeroplanes | |
| #6 | Crop agriculture | |
| #7 | Internal-combustion piston engines | |
| #8 | Metallic material cleaning | |
| #9 | Vehicle parts | |
| #10 | Vehicle connections |
| # | Name | Total Patents |
|---|---|---|
| #1 | Koehler Johannes | 6 |
| Publication | Filing date | Title |
|---|---|---|
| DE714484C | Truck powered by an electrical collector battery | |
| GB499619A | Improvements in and relating to oil actuated braking systems for vehicles | |
| GB460168A | Improvements in and relating to trailer couplings |