Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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/en
Publication of ES229002A1publicationCriticalpatent/ES229002A1/en
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.Improvements in electric sound amplifiers for telephone use, characterized in that a coupling-support of the handset is established in the amplifier box, an acoustic receiver horn being conveniently connected, the funnel of which is substantially opposite the microphone.
ES0229002A1956-06-071956-06-07
IMPROVEMENTS IN ELECTRIC SOUND AMPLIFIERS FOR TELEPHONE USE
ExpiredES229002A1
(en)
Improvements in telephones provided with microphone capsule and headset with a piezo-electric crystal (Machine-translation by Google Translate, not legally binding)
Improvements in microphones, particularly for duplex installations with speakers and microphone (Machine-translation by Google Translate, not legally binding)