| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 15 | |
| #2 | United Kingdom | 1 | |
| #3 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Optics | |
| #2 | Measurement | |
| #3 | Textiles and paper |
| # | Technology | |
|---|---|---|
| #1 | Cameras | |
| #2 | Special measuring | |
| #3 | Measuring length, angles and areas | |
| #4 | Photographic composing devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Klatt Walter | 15 |
| #2 | Kuehnle Roland | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB1128492A | Apparatus for the automatic control of the exposure time of photographic enlargers |