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G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
FR795152D1934-09-211935-09-21Perfectionnements apportés aux procédés et appareils pour l'enregistrement et la reproduction des films sonores
ExpiredFR795152A
(fr)
Perfectionnements apportés aux appareils à films pour la reproduction des sons, notamment aux appareils pour l'enregistrement et la projection de films parlants
Perfectionnements apportés aux appareils pour la reproduction des sons, notamment aux appareils pour l'enregistrement et la projection de films parlants