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Priority to ES482603ApriorityCriticalpatent/ES482603A1/es
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Mejoras en el sistema de comunicación a larga distancia mediante teléfono, caracterizado por estar constituido por una unidad central que gobierna a cuatro o más aparatos, pudiendo modificarse el estado de marcha o parada desde la unidad portátil a través de la linea telefónica y a través de esta linea, la unidad central informa del estado actual de los mismos.
ES482603A1979-07-181979-07-18Mejoras en el sistema de comunicacion en larga distancia me-diante telefono.
ExpiredES482603A1
(es)