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Publication of FR526438ApublicationCriticalpatent/FR526438A/fr
G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
FR526438A1919-11-011920-10-26Dispositif pour l'enregistrement et la reproduction de sons au moyen d'un relief de succession de sons
ExpiredFR526438A
(fr)
Dispositif pour l'enregistrement photographique des sons et leur reproduction notamment au moyen d'appareils mécaniques à musique et à bruit, des téléphones et des phonographes