| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 7 | |
| #2 | Germany | 1 | |
| #3 | France | 1 | |
| #4 | United Kingdom | 1 | |
| #5 | Italy | 1 |
| # | Industry | |
|---|---|---|
| #1 | Telecommunications |
| # | Technology | |
|---|---|---|
| #1 | Telephonic communication |
| # | Name | Total Patents |
|---|---|---|
| #1 | Rose Levi L | 6 |
| #2 | Hestad Alfred M | 5 |
| #3 | Hestad Alfred Magnus | 4 |
| #4 | Synek Jan | 4 |
| #5 | Tentler Michael | 3 |
| #6 | Hansen Harry O | 1 |
| #7 | Hansen Harold O | 1 |
| Publication | Filing date | Title |
|---|---|---|
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| US4410765A | Telephone call routing and charging system | |
| US4346261A | Speaker phones | |
| US4314107A | Subscriber station networks | |
| US4303805A | Subscriber station network | |
| US4232200A | Dialing system | |
| US4167655A | Push button to rotary dial converter systems |