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Individual
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Priority to ES0239599ApriorityCriticalpatent/ES239599A1/es
Publication of ES239599A1publicationCriticalpatent/ES239599A1/es
Sistema de llamada automática y simplificada en equipos de telefonía por ondas portadoras, caracterizado porque se han eliminado los amplificadores de la señal de llamada, destinados a tomar de la portadora aquellas señales de, normalmente, 100 ciclos destinadas o al accionamiento de la llamada de un teléfono único o a los impulsos selectivos de una centralita automática.
ES0239599A1958-01-161958-01-16Sistema de llamada automatica y simplificada en wquipos de telefonia por ondas portadoras
ExpiredES239599A1
(es)
Disposizione circuitale per rice vitori selettivi di segnali di selezione protetti da un funzio namento accidentale causato dalla voce in impianti di telecomunica zioni specie in impianti telefonici