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Individual
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Individual
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Priority to ES221769ApriorityCriticalpatent/ES221769A1/es
Publication of ES221769A1publicationCriticalpatent/ES221769A1/es
Soundproofing, Sound Blocking, And Sound Damping
(AREA)
Circuit For Audible Band Transducer
(AREA)
Headphones And Earphones
(AREA)
ES221769A1955-05-121955-05-12Perfeccionamientos en micrófonos, en particular para instalaciones duplex con altavoces y micrófono
ExpiredES221769A1
(es)
Improvements in electro-acoustic transducer which is incorporated in a capsule and comprises a transistor amplifier particularly for telephone handsets