| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Switzerland | 14 | |
| #2 | Austria | 12 | |
| #3 | France | 5 | |
| #4 | United Kingdom | 4 |
| # | Industry | |
|---|---|---|
| #1 | Telecommunications | |
| #2 | Semiconductors | |
| #3 | Control |
| # | Technology | |
|---|---|---|
| #1 | Telephonic communication | |
| #2 | Alarm systems | |
| #3 | Transmission | |
| #4 | Semiconductor devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Haftung Deutsche Telephonwerke | 14 |
| Publication | Filing date | Title |
|---|---|---|
| GB191415881A | Detector for Electromagnetic Waves. | |
| GB191007851A | A Device for Sending Current Impulses particularly applicable to Automatic Telephone Systems. | |
| GB190717455A | Improvements in Electric Signalling Apparatus. | |
| GB190712532A | Improved Contact Spring for Electrical Apparatus. |