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GB974496A
|
|
Programmed electric control system
|
|
GB981892A
|
|
Earth fault circuit-breaker
|
|
GB848294A
|
|
Electrical snap-switches
|
|
US2942168A
|
|
Automatic shunting switch for an inductance-type starting current limiting device for alternating current motors
|
|
US2833887A
|
|
Tripping device for circuit breakers for the protection of polyphase circuits against overcurrent and phase asymmetry
|
|
US2782282A
|
|
Magnetically operable switch
|
|
GB327733A
|
|
Improvements in loud-speakers
|
|
GB304951A
|
|
Improvements in or relating to electric discharge tubes
|
|
GB291775A
|
|
Electrode arrangement for electron discharge tubes
|
|
GB272843A
|
|
Method and apparatus for absorbing non precious gases in manufacturing electric discharge tubes
|
|
GB275542A
|
|
Method for producing highly emitting oxide cathodes for electron tubes
|
|
GB241439A
|
|
Grid electrodes for electron discharge tubes
|
|
US1654471A
|
|
Grid for electron-discharge tubes
|
|
US1658946A
|
|
Grid electrode for electron-discharge tubes
|
|
GB239110A
|
|
Grid for electron discharge tubes
|
|
US1745559A
|
|
Electron-discharge-tube generator
|
