| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 15 | |
| #2 | Switzerland | 12 | |
| #3 | Spain | 5 | |
| #4 | Austria | 4 | |
| #5 | Canada | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Engines, pumps and turbines | |
| #3 | Machine tools |
| # | Technology | |
|---|---|---|
| #1 | Gearing | |
| #2 | Rotary pistons | |
| #3 | Rotary-pistons | |
| #4 | Grinding or polishing devices | |
| #5 | Clutches and brakes | |
| #6 | Accessories for machine tools |
| # | Name | Total Patents |
|---|---|---|
| #1 | Sturm Erwin | 13 |
| #2 | Erwin Sturm | 12 |
| Publication | Filing date | Title |
|---|---|---|
| ES244983A3 | Hydraulic mechanism of transmission or change of speeds with two rotary flap pumps. (Machine-translation by Google Translate, not legally binding) | |
| ES164316A1 | Improvements introduced in the transfers of liquid of rotating body | |
| ES139302A1 | Special rotating machine for liquid lifting. | |
| CA552537A | Rotary pumps and motors |