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| Number | Title | Issue Date |
| 4638299 | Electrical appliance control An electrical appliance remote control system comprises a transmitter supplying digital control messages onto a power main and a receiver for receiving those messages to activate an appliances accordingly. Each message comprises words each of which is tra... | 01/20/1987 |
| 4200862 | Appliance control An applicance control system comprises a data transmitter and plurality of slave units plugged into outlet sockets of a power main of a building, appliances being coupled to the slave units. The transmitter housing includes a data input arrangement by whi... | 04/29/1980 |
| 4170359 | Gramophone equipment Gramophone equipment has a record changing mechanism including a screw arrangement which can be operated to lift and lower a record support platform.... | 10/09/1979 |
