| 3060273 | Standby transfer control circuitry | 1962-10-23 | ||
| 3025351 | Equipment for performing a complex sequence of operations | 1962-03-13 | ||
| 2955165 | Electronic telephone switching system | 1960-10-04 | ||
| 2891113 | Automatic telephone exchange systems and the like | 1959-06-16 | ||
| 2857467 | Alternative trunking in telephone systems controlled by overflow trunks and common directors | 1958-10-21 | ||
| 2851534 | Automatic telecommunication exchange system | 1958-09-09 | ||
| 2412467 | Electronic computer | 1946-12-10 |
| GB763828A | 1956-12-19 |