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Priority to ES0209633ApriorityCriticalpatent/ES209633A2/es
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Soundproofing, Sound Blocking, And Sound Damping
(AREA)
Abstract
Mejoras introducidas en los auriculares telefónicos acústicamente aislados objeto de la patente principal para evitar que terceros quedan oir lo que se habla por medio de una boquilla que con sus bordes rodea la boca del que habla y que tiene una carcasa que contiene la válvula de expiración y la válvula de aspiración así como el micrófono todo ello en forma de inserto caracterizándose porque la pieza que penetra en la carcasa (4) tiene agujeros similar a una criba.
ES0209633A1953-06-031953-06-03PERFECCIONAMIENTOS EN AURICULARES TELEFoNICOS ACuSTICAMENTE AISLADOS
ExpiredES209633A2
(es)
Improvements in electro-acoustic transducer which is incorporated in a capsule and comprises a transistor amplifier particularly for telephone handsets