|
ES136722A1
|
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Improvements in electrical communication systems.
|
|
ES134079A1
|
|
Improvements in signal systems.
|
|
ES132419A1
|
|
An automatic regulation device for powering electrical appliances by means of a current rectifier.
|
|
GB420838A
|
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Improvements relating to apparatus for the remote control of railway points, signalsand the like
|
|
GB406995A
|
|
Improvements relating to the remote control of railway points and signals or the like
|
|
ES127266A1
|
|
Improvements in signal systems for track circuit for railways and similar.
|
|
ES122903A1
|
|
Improvements introduced in traffic control devices for railways and similar.
|
|
ES119990A1
|
|
Improvements in the devices to control rail traffic.
|
|
ES119755A1
|
|
Improvements in the manufacture of electric rectifiers.
|
|
ES118968A1
|
|
Improvements in control devices for rail traffic.
|
|
ES114947A1
|
|
Improvements in braking devices for railways and similar facilities.
|
|
ES114237A1
|
|
Improvements in the control mechanisms for railway needles and their analogues.
|
|
ES112331A1
|
|
Improvements in the electrical regulation of the operation of railway needles.
|
|
ES111772A1
|
|
Improvements in light signals.
|
|
ES106464A1
|
|
Improvements in pulsating electric currents of equalization or smoothing.
|
|
ES104392A1
|
|
Improvements in illuminated signs.
|
|
ES104158A1
|
|
An electric generator that responds to light.
|
|
ES102976A1
|
|
Improvements in light signals.
|
|
ES102571A1
|
|
Improvements in current rectifier devices.
|
|
GB175455A
|
|
Improvements relating to electrically controlled signal operating mechanism for railways and the like
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