| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 5 | |
| #2 | United Kingdom | 3 | |
| #3 | Belgium | 1 | |
| #4 | Germany | 1 | |
| #5 | France | 1 |
| # | Industry | |
|---|---|---|
| #1 | Telecommunications |
| # | Technology | |
|---|---|---|
| #1 | Telephonic communication |
| # | Name | Total Patents |
|---|---|---|
| #1 | Pierre Kaelin | 7 |
| #2 | Kaelin Pierre | 2 |
| Publication | Filing date | Title |
|---|---|---|
| US2811587A | Telephone station | |
| GB669069A | Improvements relating to telephone sets | |
| GB672983A | Improvements relating to a telephone set with a device for composing call-signs | |
| US2531883A | Substation circuit with loudspeaker | |
| US2537188A | Automatic telephone station selector set for transmitting station numbers | |
| US2542535A | Device for automatically diverting telephone calls | |
| US2522119A | Recording device for telephone transmitters |