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Nokia Spain SA
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Alcatel Espana SA
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Publication of ES178444A1publicationCriticalpatent/ES178444A1/es
Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo
(AREA)
Abstract
Mejoras en sistemas de señalización eléctrica caracterizadas por un circuito de línea de enlace para señalización con dos frecuencias vocales lo que permite a las operadoras interurbanas conectar con los abonados y con las operadoras de una central distancia que está conectada bien directamente a la central originaria o bien a esta central a través de una central de enlace.
ES0178444A1942-05-301947-06-14Mejoras en sistemas de senalizacion eléctrica
ExpiredES178444A1
(es)