| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 9 | |
| #2 | United Kingdom | 3 |
| # | Industry | |
|---|---|---|
| #1 | Measurement | |
| #2 | Optics |
| # | Technology | |
|---|---|---|
| #1 | Measuring distances | |
| #2 | Cameras |
| Publication | Filing date | Title |
|---|---|---|
| GB452004A | Improvements in and relating to methods and apparatus for measuring and reproducing bodies of all kinds by photographic surveying | |
| GB442854A | Improvements in and relating to methods and apparatus for measuring and reproducing bodies of all kinds by photographic surveying | |
| GB442572A | Improvements in and relating to methods of and apparatus for aerial survey |