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Nokia Spain SA
Original Assignee
Alcatel Espana SA
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Publication date
Application filed by Alcatel Espana SAfiledCriticalAlcatel Espana SA
Publication of ES182387A1publicationCriticalpatent/ES182387A1/es
Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo
(AREA)
Abstract
Mejoras en los sistemas eléctricos de señalización en audiofrecuencia para comunicaciones a cuatro hilos comprendiendo un receptor de frecuencias audibles colocado en ,o coordinado con el canal de entrada de dicho sistema a cuatro hilos.
ES0182387A1947-02-071948-02-16MEJORAS EN LOS SISTEMAS ELÉCTRICOS DE SENALIZACIoN
ExpiredES182387A1
(es)