| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 12 | |
| #2 | Switzerland | 1 | |
| #3 | France | 1 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy | |
| #2 | Measurement |
| # | Name | Total Patents |
|---|---|---|
| #1 | Koch Sterzel | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE445789C | High voltage transformer according to patent 405441 for air or oil insulation or filling with rigid insulating compound | |
| DE393830C | Procedure for testing capacitive objects in electrical engineering for insulation resistance | |
| DE405441C | High-voltage air transformer with concentric winding, in which the externally arranged high-voltage winding is separated from the low-voltage winding by a wide air jacket |