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Publication of FR615741ApublicationCriticalpatent/FR615741A/fr
H04R1/1008—Earpieces of the supra-aural or circum-aural type
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Acoustics & Sound
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Signal Processing
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FR615741D1926-05-071926-05-07Pavillon pour écouteurs acoustiques de phonographes, télégraphes, téléphones, radio-télégraphes et radio-téléphones, etc.
ExpiredFR615741A
(fr)
Perfeccionamientos aportados en el establecimiento de los aparatos reproductores de sonidos, fonógrafos, aparatos receptores de telefonía sin hilos y otros.