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Nokia Spain SA
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Alcatel Espana SA
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Publication of ES179902A1publicationCriticalpatent/ES179902A1/es
Sub-Exchange Stations And Push- Button Telephones
(AREA)
Abstract
Mejoras en dispositivos de señalización por clave por las que se propone el empleo de disposiciones de numeración por clave en los sistemas de comunicaciones telefónicas en lugar de un sistema decimal sustituyendo los mismos que componen la señal que ha de enviarse por una combinación de un número menor de señales.
ES0179902A1946-05-281947-09-27MEJORAS EN DISPOSITIVOS DE SENALIZACIoN POR CLAVE
ExpiredES179902A1
(es)