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Individual
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Individual
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Publication of ES205377A1publicationCriticalpatent/ES205377A1/es
Soundproofing, Sound Blocking, And Sound Damping
(AREA)
Telephone Set Structure
(AREA)
Catching Or Destruction
(AREA)
Abstract
Perfeccionamientos en auriculares telefónicos acústicamente aislados para impedir que terceras personas presentes puedan oir al conversación caracterizado porque la concha del auricular en su extremo destinado a comunicar el mensaje está provista de bordes acústicamente herméticos que se ajustan perfectamente a la boca del comunicante disponiendose en dicha concha una válvula de aspiración y en su fondo asímismo una válvula de expulsión del aire.
ES0205377A1951-09-171952-09-15PERFECCIONAMIENTOS EN AURICULARES TELEFoNICOS ACuSTICAMENTE AISLADOS
ExpiredES205377A1
(es)