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RIGAU MONTSALVATGE FRANCISCO J
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RIGAU MONTSALVATGE FRANCISCO J
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Application filed by RIGAU MONTSALVATGE FRANCISCO JfiledCriticalRIGAU MONTSALVATGE FRANCISCO J
Priority to ES0229002ApriorityCriticalpatent/ES229002A1/es
Publication of ES229002A1publicationCriticalpatent/ES229002A1/es
Perfeccionamientos en amplificadores eléctricos de sonido para utilización telefónica, caracterizados por establecerse en la caja del amplificador un acoplamiento-soporte del microteléfono, disponiéndose además conectada convenientemente una bocina acústica receptora cuyo embudo queda sustancialmente enfrentado al micrófono.
ES0229002A1956-06-071956-06-07PERFECCIONAMIENTOS EN AMPLIFICADORES ELÉCTRICOS DE SONIDO PARA UTILIZACIoN TELEFoNICA
ExpiredES229002A1
(es)