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ASENSIO MARTIN MARIANO
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ASENSIO MARTIN MARIANO
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Priority to ES0201451ApriorityCriticalpatent/ES201451A1/es
Publication of ES201451A1publicationCriticalpatent/ES201451A1/es
Unos perfeccionamientos en los aparatos reproductores de señales acústicas para ser colocados en toda clase de vehículos que se caracterizan por utilizar un altavoz piezo eléctrico excitado a través de un transformador por un micrófono de carbón en serie con el primario de dicho transformador y una pila o batería.
ES0201451A1952-01-101952-01-10PERFECCIONAMIENTOS EN LOS APARATOS REPRODUCTORES DE SENALES ACuSTICAS PARA SER COLOCADOS EN TODA CLASE DE VEHiCULOS
ExpiredES201451A1
(es)
Fremgangsmaade og Apparater til Omsætning af Lydsvingninger til elektriske Svingninger med et i Forhold til Lydsvingningerne indskrænket Amplitudeomraade.