| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 4 | |
| #2 | Italy | 2 | |
| #3 | Netherlands | 2 | |
| #4 | France | 1 | |
| #5 | United Kingdom | 1 | |
| #6 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Telecommunications | |
| #2 | Basic communication technologies | |
| #3 | Machines | |
| #4 | Mechanical elements | |
| #5 | Audio-visual technology |
| # | Technology | |
|---|---|---|
| #1 | Telephonic communication | |
| #2 | Pulse technique | |
| #3 | Unspecified technologies | |
| #4 | Mechanical control devices | |
| #5 | Casings and printed circuits |
| # | Name | Total Patents |
|---|---|---|
| #1 | Diehr Helmut | 3 |
| #2 | Mietan Siegfried | 1 |
| #3 | Noack Klaus-Jochem | 1 |
| #4 | Fenske Klaus | 1 |
| #5 | Stephan Paul Dipl-Ing | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB1475199A | Circuit for avoiding the effects of contact chatter | |
| US3903381A | Key selector switch for telephone sets |