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KUNCKEL HEIN
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KUNCKEL HEIN
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Publication of ES227630A1publicationCriticalpatent/ES227630A1/es
Teléfono portátil con batería local, caracterizado porque un reforzador transistor en comunicación con un micrófono que trabaja sin batería, puede conmutarse para producir una señal de llamada, en un generador de frecuencia acústica.
ES0227630A1955-04-051956-03-28TELÉFONO PORTáTIL CON BATERiA LOCAL
ExpiredES227630A1
(es)