| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 11 | |
| #2 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Optics | |
| #2 | Measurement | |
| #3 | Basic communication technologies | |
| #4 | Computer technology |
| # | Technology | |
|---|---|---|
| #1 | Cameras | |
| #2 | Measuring light | |
| #3 | Analogue computers | |
| #4 | Tuning resonant circuits |
| # | Name | Total Patents |
|---|---|---|
| #1 | Ernst Bertram | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB1013409A | Improvements in photographic exposure meters | |
| GB1006038A | Improvements in tuning or volume indicators for electronic apparatus | |
| GB899782A | Improvements in or relating to photographic cameras diaphragm aperture selecting devices | |
| GB728867A | Improved focussing device for photographic cameras | |
| GB742599A | Improvements in photographic cameras | |
| US1931883A | Photographic exposure-meter |