| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 5 | |
| #2 | Canada | 3 | |
| #3 | United States | 3 | |
| #4 | Ireland | 2 | |
| #5 | Australia | 1 |
| # | Industry | |
|---|---|---|
| #1 | Telecommunications |
| # | Technology | |
|---|---|---|
| #1 | Selecting | |
| #2 | Telephonic communication |
| # | Name | Total Patents |
|---|---|---|
| #1 | Natarajan Krishnaswamy | 5 |
| #2 | Davis John C H | 5 |
| #3 | Szpindel Motek | 3 |
| #4 | Sidwell Jeffrey | 3 |
| #5 | Cihal Jan | 3 |
| #6 | Hatherill Richard A | 2 |
| #7 | Davis John Christopher Hammond | 1 |
| #8 | Davis John Christopher H | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US4292478A | Interface circuits | |
| US4230908A | Telephone summing circuit | |
| GB1595302A | Telephone system | |
| GB1595304A | Telephone system | |
| GB1595303A | Electronic telephone system | |
| GB1595305A | Telephone system | |
| GB1595301A | Electronic telephone system |